LMMS (Linux MultiMedia Studio) - Beat Making FreewareLMMS aims to be a free beat maker alternative to popular commercial and closed source beat making software programs like FruityLoops, Cubase and Logic, which also gives you the ability and simplicity of producing beat music with built-in loops, samples, and even notes recorded from keyboard alike midi devices.
LMMS has a friendly interface, dislike other Linux programs. You can make instrumental beats in well arranged windows, like Song Editor, Beat+Baseline Editor, FX-Effects, Projects, etc. Starting from samples, instrumental loops and presets, only drag and drop to create instrumental beats.
Download Free Beat Maker - LMMS
As to my own experience, the only bad thing is that LMMS lacks good MP3 format supported, you can't import MP3 loops (*.ogg file supported) and export instrumental beat to MP3 (WAV instead). But the good news is that there is another free audio software Audacity to help you convert *.ogg/*.wav file to MP3.
ACID Xpress - Free Beat Maker Edition of Commercial Beat MachineACID Xpress is a free, 10-track version of ACID software for rap beat making, hip hop beats and audio recording, editing and mixing. It has user friendly interface and easy to use, even if you are new to loop-based beat music creation. Just select some loops, paint them into a track and play your beat immediately. The tempo and pitch auto-match technique let any loops work together perfectly. When you're ready, output your beats and share with friends, or publish your song to ACIDplanet.com.
ACID Xpress is an easy-to-use instrumental beat maker, but only 10-track supported. For unlimited tracks and advanced features, you need to upgrade to ACID Pro music making software, or switch to LMMS, totally free instrumental beat making software.
Download free beat maker ACID Xpress
For online beat maker software, it's definitely Sonic Producer.
Try the best online beat maker software Sonic Producer