SADX Hacking Tools
SETEdit v4.0 (independent) - A tool for quickly and precisely modifying a SET item layout. Obsolete.
SADXLVL (+ SETedit) - a tool for re-arranging level models in SADX. Integrated with SETedit and other editors to effectively be a one-stop level editor. Obsolete.
SADXMDL - a model/animation viewer and editor. Obsolete.
SA1LVL - level editor for the Dreamcast version of Sonic Adventure. Obsolete.
SA Tools - a new set of tools for all versions of Sonic Adventure and Sonic Adventure 2.
SADXTweaker - a tool for editing certain minor values that might be more difficult in hex.
SADX Trainer - a tool for editing values while the game is running.
Sonic.CT version 3 (consumer) - user-friendly cheat table for messing around with various memory addresses using Cheat Engine.
SETswitch - a tool to switch the endianness of SET files, allowing you to edit files from the GameCube version with SETedit.
XBOX 360 controller patcher. Credit to Dude for the original patch.
njswitch - a tool to switch nj files between Dreamcast and PC.
obj2nj - a tool to convert an obj file to an nj file.
NJView - a tool to view and edit nj files.
SADXsndSharp - a tool for reading and altering the contents of .DAT files (sound effects).
SADXCharSwitch - allows you to switch characters and start positions, including Tikal and Eggman.
SA2 Hacking Tools
GVM2PAK - converts PVM, GVM, PVR and PRS files to PAK files for the HD port.
MDLswitch - converts MDL files between little endian and big endian.
PAKtool - unpacks and repacks files from PAK archives.
SA2 Stage Select Editor - edits the stage select in the PC version.
Other Hacking Tools
SRMapEd - A tool allowing you to edit the floor layout in Sonic R.
RAW2BMP - A tool allowing you to convert Sonic R's RAW files to Bitmaps and vice versa.
S&KCPalView - A tool for Sonic & Knuckles Collection which allows you to view and edit any of the standard palettes, and allows you to see the result of loading multiple palettes.
SonLVL - A level editor for split disassemblies of Genesis Sonic games.
SKCsnd - Edits sound effects in Sonic & Knuckles Collection.
SCDPCsnd - Edits sound effects in Sonic CD PC.
LevelConverter - Converts levels between games.
SCDPCspr - Edits sprites in Sonic CD PC.
SCDPCscr - Edits tiles in Sonic CD PC.
SCDPCSSEd - Edits Special Stage layout in Sonic CD PC.
Generations Archive Editor - Edits .ar.?? files from Sonic Generations.
GetArt.NET - Converts BMP, PNG, JPG, GIF to plane mappings.