Noisli - Noisli is a fantastic background noise and color generator for working and relaxing. Online soothing ambient sounds like White noise, Rain and Coffee Shop.
Hexomatic - The no-code point and click growth hacking platform
Noizio - Feeling that the noise of the big city is too much for you to bear?
Zontroy Generator - Let the computers do what they can
zenmix.io - Ambient background sound generator
Axiom - Axiom is a general purpose Computer Algebra system.