>>> FreeSound - A Collection of CC-Licensed Sound Effects
Freesound aims to create a huge collaborative database of audio snippets, samples, recordings, and all sorts of bleeps, ... released under Creative Commons licenses that allow their reuse. You need to register to download these samples.
>>> BBC Sound Effects
Explore a weird and wonderful collection of noises from the broadcasting behemoth. There can be few organizations that have used more sound effects than the BBC, but did you know that that the good old British Broadcasting Corporation has made more than 33,000 of its FX available for free download?
How to download using the iPad Safari browser (step by step):
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BeatCutter - Rhythm slicing recombining
BeatCutter is an experimental multi-channel app for slicing and recombining sound based on rhythm. In the center of the app is a matrix of sample cells with smoothly reconfigurable recording, playback and control busses. This app is best for those who would like to experiment with long sound files or live instruments, creating chaotic constructions and patterns from sliced rhythm-driven samples.
FieldScaper - Sound warp field recorder and scape constructor
Advanced field recorder combined with a sound warp engine and a collection of ready to use dynamic presets for iPad and iPhone. Discover new ways to create and construct unusual and exciting sounds from any environmental audio recordings or samples recorded from other apps through Inter-App audio or Audiobus.