0CC-FamiTracker is a modified version of FamiTracker that incorporates various and bug fixes which work in exported NSFs as well. The name "0CC" comes from the author's favorite arpeggio effect. The current version includes:

-Complete Sunsoft 5B support
-Arpeggio schemes
-Hardware volume envelopes
-Find / replace tab
-Detune settings
-Groove settings
-Bookmark manager
-Echo buffer access
-Delayed channel effects
-FDS automatic FM effects
-N163 wave buffer access effect
-Expansion chip selector & ad-hoc multichip NSF export

See also the change log for a list of various tweaks and improvements.

The current build is based on the 0.4.6 official release of FamiTracker and an unknown version of the NSF driver used in that release; 0CC-FamiTracker will continue to use that version in future updates unless there is great need for update, but its behaviour may not be identical if and when any of the features of this mod becomes part of the an official FamiTracker release.

http://hertzdevil.info/programs/
The download site for all versions of 0CC-Famitracker.
http://0cc-famitracker.tumblr.com/
The official development log of 0CC-FamiTracker.