OpenMPT is described as '(short hand for Open ModPlug Tracker) is a popular tracker software for Windows. OpenMPT is completely free and allows you to create and play back some great music on your computer' and is an app in the Audio & Music category. There are more than 50 alternatives to OpenMPT for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and iPhone. The best alternative is AudioTool, which is free. Other great apps like OpenMPT are Studio One (Paid), Reason (Paid), MilkyTracker (Free, Open Source) and Rosegarden (Free, Open Source).
Power Tab Editor is a free tablature authoring tool created by Brad Larsen for Windows. It is used to create guitar, bass and ukulele tablature scores, among many others. The current version uses the *.ptb file format.
Soundation Studio is the free online music making application that gives everyone the opportunity to make music on the internet. With instant access to music making tools like a loop library, virtual instruments, real time effects, automation, audio recording and editing.
Amped Studio is a modern web based music studio and production environment. With the instant access of a web application you can quickly get in to creating music with virtual instruments, effects, loops, samples and easy to use tools.