PublicAPIs - Explore the largest API directory in the galaxy
Backblaze B2 Cloud Storage - The lowest cost cloud storage on the planet: $0.005/GB/Month
Busbud Business API - Access the largest sellable bus inventory in the world!
Keka - Keka is India's most desired HR & Payroll software. Keka's HR Payroll software help organizations create the best employee experience EVER! check for a free trial.
Dropbox for Business API - Dropbox officially opens its API to businesses
SEOBOTS.io - Easy to use bots for data mining and growth hacking: parsers, crawlers and much more.