FizzBuzz Enterprise Edition is a no-nonsense implementation of FizzBuzz made by serious businessmen for serious business purposes.

A standalone Java Decompiler GUI

Tink is a multi-language, cross-platform, open source library that provides cryptographic APIs that are secure, easy to use correctly, and hard(er) to misuse.

OsmAnd

Lightning fast, open-source, < 250kb Android launcher

Project Wycheproof tests crypto libraries against known attacks.

Email-based instant messaging for Android.

IntelliJ plugin - https://plugins.jetbrains.com/plugin/2162

Custom Postfix Templates for Intellij IDEA

A Pulumi resource provider for Kubernetes to manage API resources and workloads in running clusters

Protocol Buffers for IntelliJ-based IDEs