Photosynthesis Engine
The Photosynthesis Engine is a free interface for Kontakt to make creating your own Kontakt instruments easy. Import samples, then manipulate them with sound shaping, filters, 13 effects, and a rhythm section featuring a step sequencer, filter sequencer, 2 filter LFOs, and gain/pan/pitch LFOs. Watch the engine walkthrough for a full feature overview, and take a look at the sound creation tutorial to learn how to start creating your own sounds.
The engine is open source and free to redistribute. You can share/sell any instruments you create with it, as long as all samples you used are entirely your creation.
Photosynthesis powers my two cinematic and ambient libraries, Sphere and Mystic.
It also powers libraries by Audio Imperia and Soundethers.
If you would like to use the engine to develop a library, send me a message and I'll get you started.