SDLMAME
The latest version is 0.115. There are no major changes from 0.114u4, just some bugfixes.

The stable version is also 0.115.

NOTE: The WolfMAME patches (wolfxxx.diff and mamerandxxx.diff) do apply cleanly to SDLMAME, although I can’t officially support that configuration (it’s too much extra support load for me). If you’re on Linux/Mac and want to compete on MARP, you might give it a try though. Like this:

(copy the 2 diffs in to your sdlmame folder)
% cd sdlmamexxx
% diff -p1 % diff -p1

Related links:
[ Arcade Multi Emus ][ Arcade Single Emus ]