OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

a fast, scalable, multi-language and extensible build system

Subgraph Vega

AngularJS features for the Intellij Platform (WebStorm, RubyMine, Intellij, etc)

Dhall for Java

Easily package your Maven Java application with the Nix package manager.

Spring Boot Microservices Architecture.

Simple Event Driven Microservices with Spring Cloud Stream

Geohash libraries written in Java, Lua and PHP for decoding and encoding