HammerHead is described as 'simple TR-909-like drum computer program aiming at the dance-scene. You can use it to create perfect Techno loops, Jungle patterns or House beats, but it's also suitable for Hip Hop, Triphop, Rap, Industrial and almost any other music you can think of'. There are more than 25 alternatives to HammerHead for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and iPad. The best alternative is LMMS, which is both free and Open Source. Other great apps like HammerHead are FL Studio (Paid), Ableton Live (Paid), Cakewalk (Free) and AudioTool (Free).
Bosca Ceoil is all about looping, and designed that way at its heart. Songs are built up from lots of tiny 16 note patterns – the intended workflow is that you loop over these single patterns until you have something you like, then you start making variations.
ACID Pro software is a DAW powerhouse that combines full multitrack recording and mixing, MIDI sequencing, and legendary ACID looping functionality for a seamless music-creation and post-production environment.
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.
Buzz is the first ever "easy to use" free modular software based synthesizer. What this means is that the entire system is based on objects, which may be routed in a modular fashion, giving you the freedom to be as creative as you want.
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.