Din Sync RE-303 

http://www.dinsync.info/ - Blog of the developer of the RE-303 including news of upcoming products

RE-303 Shop - The place to get the Space Cadet bundle and various other parts for the project

RE-303 Forums - The RE-303 forums for questions and answers and general info about the project 

Sonic Potions LXR

Sonic Potions - Homepage of the developer of the RE-303 CPU, the LXR drummie and more

 e-licktronic NAVA & YOCTO 

e-licktronic - Homepage, shop and forums of the developer

Jasper EDP Wasp clone

http://www.jaspersynth.co.uk/ - Homepage of the project containing all information

Adafruit

https://www.adafruit.com/ - Homepage of the developer of the x0xb0x