Although SplinterGU mainly focused on stabilizing the 0.84 branch, he has also added some new capabilities to Fenix, like a better control of the debug console (also making it display more information).
OLIVER (CICS interactive test/debug) for IBM CICS, allowed both instruction and HLL statement stepping
Powered by the GNU toolchain (GNU Compiler Collection, GNU Debugger), the SDK enables programmers to write, compile, and debug C/C++ applications for their embedded system.
PHP Debugger (including unique support for multiple parallel debug sessions)
Shortly before release, images showing debug Xbox 360 achievements from Microsoft's PartnerNet service featuring characters previously only seen in the arcade version of the game were leaked, hinting at a future game update for home systems.