Nsound is a C++ library and Python module for audio synthesis that features dynamic digital filters. Nsound lets you easily shape waveforms and write to disk or plot them. Nsound aims to be as powerful as Csound but easy to use.
Ride Tab Editor is a guitar tab editor. It features definable instruments and a customizable (but experimental) tool menu. It also features example Python scripts to output csound scores. It can be used as a text based piano roll.