UserTesting.com - Usability testing has never been easier. Get videos of real people speaking their thoughts as they use websites, mobile apps, prototypes and more!

Edit - Edit any website, no code required

Userbrain - Easy, fast, and affordable user testing for websites and prototypes.

Flagsmith - Flagsmith lets you manage feature flags and remote config across web, mobile and server side applications. Deliver true Continuous Integration. Get builds out faster. Control who has access to new features. We're Open Source.

userinput.io - Get on-demand feedback for your app, website or idea. Learn how to improve by hearing real opinions.

Splitmat - Splitmat is a URL shortener which can split your traffic between multiple pages.