- Soundation - app for creating loops, samples and sound effects. It has a sequencer, 11 real time effects, 3 synthesizers, a library of over 400 loops and a drum machine.
- Audiotool - online virtual studio featuring 808 and 909 drum machines, TB303 and ToneMatrix synths, and tons of stompbox type effects.
- Avairy's Music Creator - a multi-channel drum machine, beat maker. Has beat mode and can edit velocities.
- Jam Studio - has a little bit of everything. Create beats and add chords and harmonies.
- Drumbot - An online drum machine plus sequencer, metronome and more.
There are also quite a few apps that you can download for free that will help out with all of your audio and composing needs.
- Audacity - a free audio editor and recorder with tons of features.There are others out there but this one is arguably the best.
- Reaper - while not free, it's extremely cheap. The best thing about this software is it almost does everything all of the top of the line sequencers do at a fraction of the cost. Plus it's extremely efficient even on older machines.
- artistshouse music - a great site for music business and career advice.
- Dolmetsch Online - an older site but tons of info on music theory and composers.
- How To Practice - tons of info to make your practice session more productive.
- Musictheory.net - another great source for theory. Has tons of lessons.
- The Modal-matic - find guitar chords and chord progressionswithin a given mode.
- MyMusicTheory - another site with tons of theory lessons.
- NorthernSounds Forum - has both the orchestration and jazz course online.
- The Orchestra - a basic users manual of the symphony orchestra.
- Theta Music Trainer - a music trainer with all sorts of exercises.
- IMSLP/Petrucci Music Library - still your best source of online free sheet music and scores.