Splash Pro is described as 'totally new, simple, and powerful music creation tool and the easiest way to get creative in Garageband, Logic Pro X, or your favourite DAW. Using exclusive A' and is a music production app in the audio & music category. There are more than 50 alternatives to Splash Pro for a variety of platforms, including Mac, Windows, Linux, BSD and iPad. The best alternative is Audacity, which is both free and Open Source. Other great apps like Splash Pro are LMMS, FL Studio, Reaper and Ableton Live.
Make music online with a powerful set of tools ranging from synthesizers and samplers to mixers, delays, reverb and much more. AudioTool is an advanced, collaborative DAW (Digital Audio Workstation) built for the browser.
Reason is a virtual studio rack with all the tools and instruments you need to turn your ideas into music. And it's more than just a set of excellent synths and effects. It's a complete music system. Step into the age of Reason.
Carla is an audio plugin host, with support for many audio drivers and plugin formats. It has some nice features like automation of parameters via MIDI CC (and send output back as MIDI too) and full OSC control.
FamiStudio is very simple music editor for the Nintendo Entertainment System or Famicom. It is designed to be easier to use than FamiTracker, but its feature set is also much more limited. It is targeted at both chiptune artists and NES homebrewers.