KK-Access is a site dedicated to Komplete Kontrol and Kontakt accessibility. You will find text reviews of numerous instruments, various tips and tricks, and a host of other helpful information for your Komplete Kontrol journey.
Sample Library Review is a mainly sighted-oriented site with lots of videos, in case you wish to find out what an instrument sounds like.
Inspired by Sound, where mainly Andre Louis demonstrates the inspiring quality of instruments and plugins he uses in his own workflow.
KVR Audio Sample Libraries Forum is a great community to discuss everything about sampling and samplers and beyond.
VI/Control, a great and popular community for composers.