.TECH Domains - Domain names for the new tech revolution
Domainr - Domainr is the only ICANN-accredited domain status API provider.
Domainchamp - A SaaS search engine for domain auctions & marketplaces
Lean Domain Search - Find a Great Domain Name w/ twitter handle availability
BrandHunt V2 - Search/track domain & social media handles in real time.
Instant Domain Search - Search domain names instantly by showing results as you type.