Sorry if any of these are old news, I was unaware of any of these being dumped and made available publicly so if I'm duplicating something that's already been done just look over me. All of these work 100% on most all emulators and real hardware.
Hack of James Pond with new sprites and some new artwork
Dragon Ball Z: Final Bout
Dumped already, redumped just in case of differences.
Mortal Kombat 6 28 People
Dumped already, redumped in case of differences. Play it to see how lazy some hack jobs are.
Samurai Spirits II
Dumped already but rather hard to locate.
Top Fighter 2005
Really just Top Fighter 2000 MKVIII translated from English to Chinese... I can see no other changes.
Lord of the Rings aka Lord of the Rings 3: Return of the King
Chinese Fighter III with excellent sprite edits
Russian hack of Decap Attack with new sprites and some cutscenes
Soul Blade Super
Copy protection removed, works fine in both emulators and real hardware. Previous version I always ran into still had the copy protection present and hung at the first match.
Russian hack of Super Skidmarks, possibly title screen only hack?
Russian hack of Rolo to the Rescue, with new sprites and some cutscenes
Russian hack of Awesome Possum, minimal sprite hack, new title screen and level layout changes
King of Fighters 2000
Just a title screen hack of '98