Hoppscotch : A free, online, open source API request builder
Kroki : Convert plain text diagrams to images !
Kroki provides a unified API with support for BlockDiag (BlockDiag, SeqDiag, ActDiag, NwDiag), C4 (with PlantU...
Pipes : Pipes is a powerful composition tool to aggregate, manipulate, and mashup content from around the web.
htty : htty is a console application for interacting with web servers. It’s a fun way to explore web APIs and to learn the ins and outs of HTTP.
Cockpit : Simple Content Platform to manage any structured content.
A self-hosted headless and api-driven CMS.
Bluepine is a DSL for defining API Schema/Endpoint with the capabilities to generate Open API (v3) spec, validate API request and serialize object for API response based on single schema definition.