What are some alternatives?
Pure Data - Pd (aka Pure Data) is a real-time graphical programming environment for audio, video, and graphical...
ContextSmith Free Email Tracker - Know when and where your emails are read
Sonic Pi - Sonic Pi is a new kind of instrument for a new generation of musicians. It is simple to learn, powerful enough for live performances and free to download.
Unlimited Email Tracker - Track opens and clicks, set reminders and delays in Gmail
ChucK - A strongly-timed, concurrent, and on-the-fly audio programming language
Mixmax for Google Inbox - The essential productivity suite (tracking, calendar & more)