FamiStudio is a free simple, DAW-style, music editor for the Nintendo Entertainment System. It is designed for both chiptune enthusiasts and the NES homebrew community.
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T.Rex64
Max Project added a C64 drum machine to their free collection.
DefleMask
DefleMask is a free (Donations possible) cross-platform chiptune music tracker.
It is available for Windows, Mac OS X, Linux, iOS and Android.
Socalabs 8-Bit Treats
3 free game console synthesis plugins. Emulations of some of the most iconic chips including the Ricoh A203 (Nintendo), PAPU (Gameboy), MOS Technology SID (Commodore 64, 128 & MAX) and TI SN76489 (Sega, BBC etc).
GB Drumbox
GB DrumBox is a sample-based Game Boy virtual instrument for PC and Mac