Top 4 ratpack open source projects

Security engine for Java (authentication, authorization, multi frameworks): OAuth, CAS, SAML, OpenID Connect, LDAP, JWT...

A simple grocery list webapplication implemented with the Microframeworks Spark Java, Jodd, Ninja, Javalite, Pippo and Ratpack

The minimal dev environment to enable live-editing React components from a JVM Ratpack server

Cryptocurrency components for JVM & Android (JSON client & server support, services, DSL, CLI)