Beeceptor - Unblock yourself from API dependencies, and build & integrate with APIs fast. Beeceptor helps you build a mock Rest API in a few seconds.
SSuite Axcel Professional Spreadsheet - This powerful and professional spreadsheet has all the tools you need to calculate, analyse, summarize, and present your data in numerical reports or colourful graphics.
Request inspector - Debug web hooks, http clients
EtherCalc - EtherCalc is a web spreadsheet.
RequestWatch - Inspect and debug HTTP requests
Keikai - Effortlessly Build Spreadsheet-driven Web Apps