Suyu has been taken down, for now anyways...

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Stella is a multi-platform Atari 2600 VCS emulator which was originally developed for Linux, but since its original release several people have joined the development team to port Stella to other operating systems such as AcornOS, AmigaOS, DOS, FreeBSD, IRIX, Linux, OS/2, MacOS, Unix, and Windows.
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Nintaco is a cycle-accurate Nintendo Entertainment System / Famicom written in Java. It supports most games including those for the Famicom Disk System, Dendy, UniSystem, DualSystem and much more. You can also rewind, watch, export and resume play. It also supports netplay, save states...
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