Tools
Genesis Plus GX

Genesis emulator for the Nintendo Wii. For more information: http://wiibrew.org/wiki/Genesis_Plus (external link)

By Charles MacDonald

Media:
Kega Fusion Emulator

Genesis emulator for PC and other platforms. For more information: http://segaretro.org/Kega_Fusion (external link)

By Steve Snake

Media:
Regen Emulator

Genesis emulator for the PC, Linux ports available. For more information: http://segaretro.org/Regen (external link)

By AamirM

Media:
RetroArch

Genesis emulator frontend for PC and other platforms. For more information: https://www.retroarch.com/index.php (external link) (external link)

By The Libretro Team

Media:
RTA-TB LiveSplit module

A tool that automates timing for S3&K's timing system. Make sure to read the readme while setting it up! (external link)

By Sophira

Media:
Saves
Gens save states (S+T,S)

Collection of Save States that can be used in Gens, to test out strategies etc. (external link)

By BenInSweden

Media:
SRAM with S+T 100% completed

Compatible with at least Everdrive and Retroarch. Has completed save files with all emeralds collected in slots 1 and 2. Can be used for New Game+ or All Emeralds (by erasing Slot 1). (direct download)

By BenInSweden

Media:
SRAM with S+T completed in Slot 2

Compatible with at least Everdrive and Retroarch. Has a complete save file in Slot 2 for Sonic and Tails to be able to practice acts, leaving Slot 1 free for runs. (direct download)

By BenInSweden

Media:
Splits
None yet
Patches
None yet