Kroki : Convert plain text diagrams to images !
Kroki provides a unified API with support for BlockDiag (BlockDiag, SeqDiag, ActDiag, NwDiag), C4 (with PlantU...
HTTP API design : This guide describes a set of HTTP+JSON API design practices, originally extracted from work on the Heroku Platform API.
Cockpit : Simple Content Platform to manage any structured content.
A self-hosted headless and api-driven CMS.
Pipes : Pipes is a powerful composition tool to aggregate, manipulate, and mashup content from around the web.
Hoppscotch : A free, online, open source API request builder
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.