Ghidra is a software reverse engineering (SRE) framework

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.

Android application powering the mirror in my house

Heritrix is the Internet Archive's open-source, extensible, web-scale, archival-quality web crawler project.

Smithy is a protocol-agnostic interface definition language and set of tools for generating clients, servers, and documentation for any programming language.