diff --git a/.gitignore b/.gitignore
index 1fda17e..723a319 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,6 @@
 # Build directories
-build.fx/
-build.cg/
+build-fx/
+build-cg/
 
 # Targets
 gintctl.g1a
diff --git a/Makefile b/Makefile
old mode 100755
new mode 100644
index 57ed664..991c2ba
--- a/Makefile
+++ b/Makefile
@@ -1,53 +1,69 @@
 #! /usr/bin/make -f
-#  Makefile for the gint control add-in
+#  Default Makefile for fxSDK add-ins. This file was probably copied there by
+#  the [fxsdk] program.
 #---
 
 #
 #  Configuration
 #
 
+include project.cfg
+
 # Compiler flags
-cf        := -mb -ffreestanding -nostdlib -Wall -Wextra -std=c11 -Os \
-             -fstrict-volatile-bitfields -I include
+cf        := -mb -ffreestanding -nostdlib -Wall -Wextra \
+             -fstrict-volatile-bitfields $(CFLAGS)
 cf-fx     := $(cf) -m3 -DFX9860G
 cf-cg     := $(cf) -m4-nofpu -DFXCG50
 
 # Linker flags
-lf-fx     := -Tfx9860g.ld -lprof -lgint-fx -lgcc -Wl,-Map=build.fx/map
-lf-cg     := -Tfxcg50.ld  -lprof -lgint-cg -lgcc -Wl,-Map=build.cg/map
+lf-fx     := $(LDFLAGS) -Tfx9860g.ld -lgint-fx -lgcc -Wl,-Map=build-fx/map
+lf-cg     := $(LDFLAGS) -Tfxcg50.ld  -lgint-cg -lgcc -Wl,-Map=build-cg/map
 
 dflags     = -MMD -MT $@ -MF $(@:.o=.d) -MP
 cpflags   := -R .bss -R .gint_bss
 
-g1af      := -i assets-fx/icon.png -n gintctl --internal=@GINTCTL
-g3af      := -n basic:" " -i uns:assets-cg/icon-uns.png \
-             -i sel:assets-cg/icon-sel.png
+g1af      := -i "$(ICON_FX)" -n "$(NAME)" --internal="$(INTERNAL)"
+g3af      := -n basic:"$(NAME)" -i uns:"$(ICON_CG_UNS)" -i sel:"$(ICON_CG_SEL)"
 
 #
 #  File listings
 #
 
-elf        = $(dir $<)gintctl.elf
-bin        = $(dir $<)gintctl.bin
-target-fx := gintctl.g1a
-target-cg := gintctl.g3a
+null      :=
+filename  := $(subst $(null) $(null),-,$(NAME))
 
-# Source and object files
-src       := $(shell find src -name '*.c')
-assets-fx := $(wildcard assets-fx/*.png)
-assets-cg := $(wildcard assets-cg/*.png)
-obj-fx    := $(src:%.c=build.fx/%.o) $(assets-fx:assets-fx/%=build.fx/%.o)
-obj-cg    := $(src:%.c=build.cg/%.o) $(assets-ch:assets-cg/%=build.cg/%.o)
+elf        = $(dir $<)$(filename).elf
+bin        = $(dir $<)$(filename).bin
+target-fx := $(filename).g1a
+target-cg := $(filename).g3a
+
+# Source files
+src       := $(wildcard src/*.c src/*/*.c src/*/*/*.c src/*/*/*/*.c)
+assets-fx := $(wildcard assets-fx/*/*)
+assets-cg := $(wildcard assets-cg/*/*)
+
+# Object files
+obj-fx  := $(src:%.c=build-fx/%.o) $(assets-fx:assets-fx/%=build-fx/assets/%.o)
+obj-cg  := $(src:%.c=build-cg/%.o) $(assets-cg:assets-cg/%=build-cg/assets/%.o)
 
 # Additional dependencies
-deps-fx   := assets-fx/icon.png
-deps-cg   := assets-cg/icon-uns.png assets-cg/icon-sel.png
+deps-fx := $(ICON_FX)
+deps-cg := $(ICON_CG_UNS) $(ICON_CG_SEL)
+
+# All targets
+all :=
+ifneq "$(wildcard build-fx)" ""
+all += all-fx
+endif
+ifneq "$(wildcard build-cg)" ""
+all += all-cg
+endif
 
 #
 #  Build rules
 #
 
-all: all-fx all-cg
+all: $(all)
 
 all-fx: $(target-fx)
 all-cg: $(target-cg)
@@ -65,21 +81,32 @@ $(target-cg): $(obj-cg) $(deps-cg)
 	mkg3a $(g3af) $(bin) $@
 
 # C sources
-build.fx/%.o: %.c
+build-fx/%.o: %.c
 	@ mkdir -p $(dir $@)
 	sh3eb-elf-gcc -c $< -o $@ $(cf-fx) $(dflags)
-build.cg/%.o: %.c
+build-cg/%.o: %.c
 	@ mkdir -p $(dir $@)
 	sh4eb-elf-gcc -c $< -o $@ $(cf-cg) $(dflags)
 
 # Images
-build.fx/%.png.o: assets-fx/%.png
+build-fx/assets/img/%.o: assets-fx/img/%
 	@ mkdir -p $(dir $@)
-	fxconv -i $< -o $@ name:$*
-build.cg/%.png.o: assets-cg/%.png
-	@ echo -e "\e[31;1mWARNING: conversion for fxcg50 not supported yet\e[0m"
+	fxconv -i $< -o $@ name:img_$(basename $*)
+
+build-cg/assets/img/%.o: assets-cg/img/%
+	@ echo -ne "\e[31;1mWARNING: image conversion for fxcg50 is not "
+	@ echo -ne "supported yet\e[0m"
 	@ mkdir -p $(dir $@)
-	fxconv -i $< -o $@ name:$*
+	fxconv -i $< -o $@ name:img_$(basename $*)
+
+# Fonts
+build-fx/assets/fonts/%.o: assets-fx/fonts/%
+	@ mkdir -p $(dir $@)
+	fxconv -f $< -o $@ name:font_$(basename $*) $(FONT.$*)
+
+build-cg/assets/fonts/%.o: assets-cg/fonts/%
+	@ mkdir -p $(dir $@)
+	fxconv -f $< -o $@ name:font_$(basename $*) $(FONT.$*)
 
 #
 #  Cleaning and utilities
@@ -87,9 +114,9 @@ build.cg/%.png.o: assets-cg/%.png
 
 # Dependency information
 -include $(shell find build* -name *.d 2> /dev/null)
-build.fx/%.d: ;
-build.cg/%.d: ;
-.PRECIOUS: build.fx build.cg build.fx/%.d build.cg/%.d %/
+build-fx/%.d: ;
+build-cg/%.d: ;
+.PRECIOUS: build-fx build-cg build-fx/%.d build-cg/%.d %/
 
 clean:
 	@ rm -rf build*
diff --git a/assets-fx/fonts/hexa.png b/assets-fx/fonts/hexa.png
new file mode 100644
index 0000000..1841de1
Binary files /dev/null and b/assets-fx/fonts/hexa.png differ
diff --git a/assets-fx/img/opt_gint_gray.png b/assets-fx/img/opt_gint_gray.png
new file mode 100644
index 0000000..725d4aa
Binary files /dev/null and b/assets-fx/img/opt_gint_gray.png differ
diff --git a/assets-fx/opt_gint_timers.png b/assets-fx/img/opt_gint_timers.png
similarity index 100%
rename from assets-fx/opt_gint_timers.png
rename to assets-fx/img/opt_gint_timers.png
diff --git a/assets-fx/opt_main.png b/assets-fx/img/opt_main.png
similarity index 100%
rename from assets-fx/opt_main.png
rename to assets-fx/img/opt_main.png
diff --git a/assets-fx/img/opt_mem.png b/assets-fx/img/opt_mem.png
new file mode 100644
index 0000000..af226bb
Binary files /dev/null and b/assets-fx/img/opt_mem.png differ
diff --git a/assets-fx/opt_perf_libprof.png b/assets-fx/img/opt_perf_libprof.png
similarity index 100%
rename from assets-fx/opt_perf_libprof.png
rename to assets-fx/img/opt_perf_libprof.png
diff --git a/assets-fx/opt_perf_render.png b/assets-fx/img/opt_perf_render.png
similarity index 100%
rename from assets-fx/opt_perf_render.png
rename to assets-fx/img/opt_perf_render.png
diff --git a/assets-fx/img/profile_gray.png b/assets-fx/img/profile_gray.png
new file mode 100644
index 0000000..4b2e448
Binary files /dev/null and b/assets-fx/img/profile_gray.png differ
diff --git a/assets-fx/img/profile_gray_alpha.png b/assets-fx/img/profile_gray_alpha.png
new file mode 100644
index 0000000..45ec67f
Binary files /dev/null and b/assets-fx/img/profile_gray_alpha.png differ
diff --git a/assets-fx/img/profile_mono.png b/assets-fx/img/profile_mono.png
new file mode 100644
index 0000000..d1b2e99
Binary files /dev/null and b/assets-fx/img/profile_mono.png differ
diff --git a/assets-fx/img/profile_mono_alpha.png b/assets-fx/img/profile_mono_alpha.png
new file mode 100644
index 0000000..c54097e
Binary files /dev/null and b/assets-fx/img/profile_mono_alpha.png differ
diff --git a/include/gintctl/gint.h b/include/gintctl/gint.h
index b9c7480..3821bed 100644
--- a/include/gintctl/gint.h
+++ b/include/gintctl/gint.h
@@ -11,4 +11,14 @@ void gintctl_gint_hardware(void);
 /* gintctl_gint_timer(): Show the timer status in real-time */
 void gintctl_gint_timer(void);
 
+#ifdef FX9860G
+
+/* gintctl_gint_gray(): Gray engine tuning */
+void gintctl_gint_gray(void);
+
+/* gintctl_gint_grayrender(): Gray rendering functions */
+void gintctl_gint_grayrender(void);
+
+#endif /* FX9860G */
+
 #endif /* GINTCTL_GINT */
diff --git a/include/gintctl/mem.h b/include/gintctl/mem.h
new file mode 100644
index 0000000..1e6d2d8
--- /dev/null
+++ b/include/gintctl/mem.h
@@ -0,0 +1,11 @@
+//---
+//	gintctl:mem - Memory browser
+//---
+
+#ifndef GINTCTL_MEM
+#define GINTCTL_MEM
+
+/* gintctl_mem(): Memory browser */
+void gintctl_mem(void);
+
+#endif /* GINTCTL_MEM */
diff --git a/project.cfg b/project.cfg
new file mode 100644
index 0000000..e14bd80
--- /dev/null
+++ b/project.cfg
@@ -0,0 +1,22 @@
+#---
+# fxSDK project configuration file for gintctl
+#---
+
+# Project name, should be at most 8 bytes long.
+NAME = gintctl
+# Internal name, should be '@' followed by at most 7 uppercase letters.
+INTERNAL = @GINTCTL
+
+# fx-9860G icon location
+ICON_FX = assets-fx/icon.png
+# fx-CG 50 icon locations
+ICON_CG_UNS = assets-cg/icon-uns.png
+ICON_CG_SEL = assets-cg/icon-sel.png
+
+# Additional compiler flags
+CFLAGS = -std=c11 -Os -I include
+# Additional linker flags
+LDFLAGS = -lprof
+
+# Parameters for the hexadecimal font on fx9860g
+FONT.hexa.png = charset:print grid.size:3x5 grid.padding:1
diff --git a/src/gint/gray.c b/src/gint/gray.c
new file mode 100644
index 0000000..d2dac3e
--- /dev/null
+++ b/src/gint/gray.c
@@ -0,0 +1,130 @@
+#ifdef FX9860G
+
+#include <gint/gray.h>
+#include <gint/keyboard.h>
+#include <gint/std/string.h>
+#include <gint/std/stdio.h>
+#include <gintctl/gint.h>
+
+/* gintctl_gint_gray(): Gray engine tuning */
+void gintctl_gint_gray(void)
+{
+	uint32_t delays[2];
+	gray_config(&delays[0], &delays[1]);
+
+	int key = 0, sel = 0;
+	char str[20];
+
+	gray_start();
+
+	while(key != KEY_EXIT)
+	{
+		gclear(C_WHITE);
+
+		gtext(1, 0, "Gray engine tuning", C_BLACK, C_NONE);
+
+		sprintf(str, "Light%5u", delays[0]);
+		gtext(13, 24, str, C_BLACK, C_NONE);
+		sprintf(str, "Dark %5u", delays[1]);
+		gtext(13, 32, str, C_BLACK, C_NONE);
+
+		int y = 24 + (sel << 3);
+		gtext(7, y, "<", C_BLACK, C_NONE);
+		gtext(73, y, ">", C_BLACK, C_NONE);
+
+		grect(96, 16, 127, 31, C_LIGHT);
+		grect(96, 32, 127, 47, C_DARK);
+
+		extern image_t img_opt_gint_gray;
+		gimage(0, 56, &img_opt_gint_gray);
+
+		gupdate();
+		key = getkey().key;
+
+		if(key == KEY_UP && sel) sel = 0;
+		if(key == KEY_DOWN && !sel) sel = 1;
+
+		if(key == KEY_LEFT)
+			delays[sel]--;
+		else if(key == KEY_RIGHT)
+			delays[sel]++;
+		else if(key == KEY_F1)
+			/* TODO: Default settings */ ;
+		else if(key == KEY_F2)
+			/* TODO: Default settings */ ;
+		else if(key == KEY_F3)
+			/* TODO: Default settings */ ;
+		else continue;
+
+		if(delays[sel] < 100) delays[sel] = 100;
+		if(delays[sel] > 3000) delays[sel] = 3000;
+		gray_delays(delays[0], delays[1]);
+	}
+	gray_stop();
+}
+
+/* gintctl_gint_grayrender(): Gray rendering functions */
+void gintctl_gint_grayrender(void)
+{
+	int x, y;
+
+	gray_start();
+	gclear(C_WHITE);
+
+	gtext(1, 1, "Gray rendering", C_BLACK, C_NONE);
+
+	x = 6, y = 12;
+	grect(x,      y,      x + 15, y + 15, C_WHITE);
+	grect(x + 16, y,      x + 31, y + 15, C_LIGHT);
+	grect(x + 32, y,      x + 47, y + 15, C_DARK);
+	grect(x + 48, y,      x + 63, y + 15, C_BLACK);
+	grect(x,      y,      x + 63, y +  3, C_LIGHTEN);
+	grect(x,      y + 12, x + 63, y + 15, C_DARKEN);
+
+	x = 104, y = 0;
+	grect(x, y, x + 23, y + 32, C_BLACK);
+	gtext(x - 13, y + 1,  "White", C_WHITE, C_NONE);
+	gtext(x - 13, y + 9,  "Light", C_LIGHT, C_NONE);
+	gtext(x - 13, y + 17, "Dark",  C_DARK,  C_NONE);
+	gtext(x - 13, y + 25, "Black", C_BLACK, C_NONE);
+
+	x = 76, y = 33;
+	grect(x,      y, x + 12, y + 24, C_WHITE);
+	grect(x + 13, y, x + 25, y + 24, C_LIGHT);
+	grect(x + 26, y, x + 38, y + 24, C_DARK);
+	grect(x + 39, y, x + 51, y + 24, C_BLACK);
+	gtext(x + 8, y + 1,  "Lighten", C_LIGHTEN, C_NONE);
+	gtext(x + 8, y + 9,  "Darken",  C_DARKEN,  C_NONE);
+	gtext(x + 8, y + 17, "Invert",  C_INVERT,  C_NONE);
+
+	extern image_t img_profile_mono;
+	extern image_t img_profile_mono_alpha;
+	extern image_t img_profile_gray;
+	extern image_t img_profile_gray_alpha;
+
+	x = 8, y = 32;
+	for(int c = 0; c < 8; c++)
+	{
+		int z = x + 8 * c + 3;
+		gline(z, y, z + 3, y + 3, c);
+		gline(z - 1, y + 1, z - 3, y + 3, c);
+		gline(z + 2, y + 4, z, y + 6, c);
+		gline(z - 2, y + 4, z - 1, y + 5, c);
+	}
+
+	x = 2, y = 42;
+	for(int j = 0; j < 20; j++)
+	for(int i = 0; i < 74; i++)
+		gpixel(x + i, y + j, (i ^ j) & 1 ? C_BLACK : C_WHITE);
+	gimage(x +  2, y + 2, &img_profile_mono);
+	gimage(x + 20, y + 2, &img_profile_mono_alpha);
+	gimage(x + 38, y + 2, &img_profile_gray);
+	gimage(x + 56, y + 2, &img_profile_gray_alpha);
+
+	gupdate();
+	getkey();
+
+	gray_stop();
+}
+
+#endif /* FX9860G */
diff --git a/src/gint/timer.c b/src/gint/timer.c
index 9d9d1f8..0dd3458 100644
--- a/src/gint/timer.c
+++ b/src/gint/timer.c
@@ -102,8 +102,8 @@ void gintctl_gint_timer(void)
 		if(tab == 2) show_etmu_1();
 		if(tab == 3) show_etmu_2();
 
-		extern image_t opt_gint_timers;
-		dimage(0, 56, &opt_gint_timers);
+		extern image_t img_opt_gint_timers;
+		dimage(0, 56, &img_opt_gint_timers);
 		#endif
 
 		#ifdef FXCG50
diff --git a/src/gintctl.c b/src/gintctl.c
index 06e08f9..93ee6b7 100644
--- a/src/gintctl.c
+++ b/src/gintctl.c
@@ -12,6 +12,7 @@
 
 #include <gintctl/gint.h>
 #include <gintctl/perf.h>
+#include <gintctl/mem.h>
 
 #include <libprof.h>
 
@@ -41,7 +42,8 @@ struct menu menu_gint = {
 	{ "Image rendering",  NULL },
 	{ "Text rendering",   NULL },
 	#ifdef FX9860G
-	{ "Gray engine",      NULL },
+	{ "Gray engine",      gintctl_gint_gray },
+	{ "Gray rendering",   gintctl_gint_grayrender },
 	#endif
 	{ NULL, NULL },
 }};
@@ -139,7 +141,6 @@ void gintctl_main(void)
 	#endif /* FXCG50 */
 }
 
-
 int main(GUNUSED int isappli, GUNUSED int optnum)
 {
 	/* Initialize menu metadata */
@@ -161,8 +162,8 @@ int main(GUNUSED int isappli, GUNUSED int optnum)
 		else gintctl_main();
 
 		#ifdef FX9860G
-		extern image_t opt_main;
-		dimage(0, 56, &opt_main);
+		extern image_t img_opt_main;
+		dimage(0, 56, &img_opt_main);
 		#else
 		fkey_action(1, "INFO");
 		fkey_menu(2, "GINT");
@@ -183,7 +184,7 @@ int main(GUNUSED int isappli, GUNUSED int optnum)
 		if(key == KEY_F5)
 			gintctl_regs();
 		if(key == KEY_F6)
-			/* TODO: Launch memory explorer */ { }
+			gintctl_mem();
 
 		if(!menu) continue;
 
diff --git a/src/mem/mem.c b/src/mem/mem.c
new file mode 100644
index 0000000..c4624a9
--- /dev/null
+++ b/src/mem/mem.c
@@ -0,0 +1,77 @@
+#include <gint/display.h>
+#include <gint/keyboard.h>
+#include <gint/std/stdio.h>
+
+#include <gintctl/mem.h>
+#include <gintctl/util.h>
+
+int c(int c)
+{
+	return (c >= 0x20 && c < 0x7f) ? c : '.';
+}
+
+/* gintctl_mem(): Memory browser */
+void gintctl_mem(void)
+{
+	uint32_t base = 0x88010758;
+	int key = 0, ascii = 0;
+
+	#ifdef FX9860G
+	extern font_t font_hexa;
+	font_t const *old_font = dfont(&font_hexa);
+
+	char header[12];
+	char bytes[24];
+
+	while(key != KEY_EXIT)
+	{
+		dclear(C_WHITE);
+
+		uint32_t addr = base;
+		uint8_t *mem = (void *)addr;
+
+		for(int i = 0; i <= 8; i++)
+		{
+			if(!ascii)
+			{
+				sprintf(header, "%08X:", addr);
+			}
+			else
+			{
+				for(int k = 0; k < 8; k++)
+					header[k] = c(mem[k]);
+				header[8] = 0;
+			}
+
+			sprintf(bytes, "%02X%02X %02X%02X %02X%02X %02X%02X",
+				mem[0], mem[1], mem[2], mem[3],
+				mem[4], mem[5], mem[6], mem[7]
+			);
+
+			dtext( 5, 6 * i + 1, header, C_BLACK, C_NONE);
+			dtext(45, 6 * i + 1, bytes,  C_BLACK, C_NONE);
+
+			mem += 8;
+			addr += 8;
+		}
+
+		extern image_t img_opt_mem;
+		dsubimage(0, 56, &img_opt_mem, 0, 0, 128, 8, DIMAGE_NONE);
+
+		if(ascii)
+		{
+			dsubimage(107, 56, &img_opt_mem, 107, 9, 21, 8, DIMAGE_NONE);
+		}
+
+		dupdate();
+		key = getkey().key;
+
+		if(key == KEY_UP) base -= 72;
+		if(key == KEY_DOWN) base += 72;
+
+		if(key == KEY_F6) ascii = !ascii;
+	}
+
+	dfont(old_font);
+	#endif
+}
diff --git a/src/perf/libprof.c b/src/perf/libprof.c
index 6576b62..3ac7833 100644
--- a/src/perf/libprof.c
+++ b/src/perf/libprof.c
@@ -55,8 +55,8 @@ void gintctl_perf_libprof(void)
 			row_print(6, 1, "Empty: %d us", empty);
 		}
 
-		extern image_t opt_perf_libprof;
-		dimage(0, 56, &opt_perf_libprof);
+		extern image_t img_opt_perf_libprof;
+		dimage(0, 56, &img_opt_perf_libprof);
 		#endif /* FX9860G */
 
 		#ifdef FXCG50
diff --git a/src/perf/render.c b/src/perf/render.c
index d9f60a7..4183314 100644
--- a/src/perf/render.c
+++ b/src/perf/render.c
@@ -75,8 +75,8 @@ void gintctl_perf_render(void)
 			row_print(6, 1, "rect3:   %s", printtime(time.rect3));
 		}
 
-		extern image_t opt_perf_render;
-		dimage(0, 56, &opt_perf_render);
+		extern image_t img_opt_perf_render;
+		dimage(0, 56, &img_opt_perf_render);
 		#endif
 
 		#ifdef FXCG50