VocProc is an LV2 plugin for pitch shifting (with or without formant correction),
vocoding,
automatic pitch correction, and harmonizing of singing voices.
OpenHantek is an application for controlling Hantek (Voltcraft/Darkwire/Protek/Acetech) USB DSOs based on HantekDSO. It draws charts using OpenGL and allows triggers, time base, math functions, and other settings to be manipulated.