SCDPlay is a program that can play the videos in STM format you can find in your CD of Sonic CD for the MegaCD. It can also dump video and sound data from the videos to bitmaps and WAV, respectively.
Gens is a Sega Mega Drive (Genesis), 32X, and Mega CD emulator with a GUI with many features.
A file de-duplication, organization, and bulk previewing tool.
A benchmark to estimate the memory bandwidth of computers.