Backblaze B2 Cloud Storage - The lowest cost cloud storage on the planet: $0.005/GB/Month
API List - A collective list of APIs. Build something.
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.
Phantombuster - A marketplace of simple to use no-code APIs
SEOBOTS.io - Easy to use bots for data mining and growth hacking: parsers, crawlers and much more.
The Unsplash API - No-limits, do-what-you-want API for access to 200K+ HD pics.