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.
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. Also includes a tool for 256 files.
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.