GarageBand!

LMMS is a free cross-platform alternative to commercial programs like FL Studio , which allow you to produce music with your computer. This includes the creation of melodies and beats, the synthesis and mixing of sounds, and arranging of samples. You can have fun with your MIDI-keyboard and much more; all in a user-friendly and modern interface.

Ardour is a hard disk recorder and digital audio workstation application. It runs on GNU/Linux, Mac OS X, and Windows. Ardour's intention is to provide digital audio workstation software suitable for professional use.

REAPER is a complete digital audio production application for Windows and OS X, offering a full multitrack audio and MIDI recording, editing, processing, mixing and mastering toolset.

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Live is software for creating musical ideas, turning them into finished songs, and even taking them onto the stage.

Walk Band is a music studio (a toolkit of virtual musical instruments) customized for Android. It contains tons of features including Piano, Guitar, Drum Kit,Drum Machine, Bass, Multi-tracks synthesizer etc. All instruments use the realistic instrument sounds. You can add the drum beats and guitar chords to your piano melody. Play your favorite music everywhere with your phone. Another fantastic feature, External MIDI Keyboard over USB is also supported. You can connect your YAMAHA, Roland midi keyboard/controller with Walk Band. »

Cubase is a computer program for music production/recording.The program offers recording, producing and mixing of sounds in order to make music production for distribution on CDs or the internet.

Sound Forge Pro software efficiently and reliably provides audio editors and producers complete control over all aspects of audio editing and mastering. Whether in the studio or field, it's the ultimate all-in-one production suite for professional audio recording and mastering, sound design, audio restoration, and Red Book CD creation.

Logic Pro lets you translate musical inspiration into professional productions. A range of powerful, easy-to-use features puts sophisticated tools at your fingertips, and complete surround support lets you make incredible, immersive music.

Bitwig Studio is a multi-platform music-creation system for production, performance and DJing, with a focus on flexible editing tools and a super-fast workflow.

Qtractor is an Audio/MIDI multi-track sequencer application written in C++ with the Qt framework. Target platform is Linux, where the Jack Audio Connection Kit (JACK) for audio, and the Advanced Linux Sound Architecture (ALSA) for MIDI, are the main infrastructures to evolve as a fairly-featured Linux desktop audio workstation GUI, specially dedicated to the personal home-studio.

Tracktion is an advanced DAW (Digital Audio Workstation) that uses an intuitive, single-screen interface to ease the music production workflow.

WaveShop is a free, open-source audio editor for Windows XP/Vista/7. WaveShop is fast, lightweight, and bit-perfect, meaning samples aren't altered unless they need to be. Editing a portion of an audio file only affects that portion; the rest of the file is untouched. Blocks of audio can be cut and pasted without changing their contents at all. This is especially useful for patching a finished master without corrupting its dither. Waveshop's features include peak and RMS analysis, normalizing, fading, audio generation, and more, all with unlimited undo. »