One Word Domains - Database of all available one-word domains
Domainz.io - Premium domains, for not so premium prices
Dictionary Domains - Unregistered dictionary word domains for your side project
Newsy - Monetize your un-used domains and turn them into your own content aggregator with 0 code!
Handshake.org - Decentralized certificate authority and naming
DomainWatch - Domain Monitoring Made Easy