jhipster/jhipster

Java Design Patterns is an open-source GitHub project by iluwatar that documents design patterns as commented, working Java code rather than diagrams or prose. The repository is organized so readers can find a pattern by name, by tag such as Gang of Four or Performance, or by category, with a companion site and an optional paid e-book alongside it.

Spring Boot is an opinionated layer on top of Spring that handles the boilerplate you'd otherwise write for every project — auto-configuration for embedded servers, security, metrics, and health endpoints — so you can ship a runnable JAR with `java -jar` without touching XML. The trade-off is that you're buying into Spring's conventions hard; when your requirements genuinely diverge from the defaults, the "get out of the way" promise only goes so far and you're still digging through Spring's layered configuration model. It genuinely skips code generation and XML, which is rare for a framework this feature-complete, and the Gradle-based build with JDK 25 requirement tells you this is aimed at teams with a modern JVM already in place.

The Algorithms - Java is a community-maintained GitHub repository collecting Java implementations of sorting algorithms, search algorithms, and core data structures, organized for study rather than production use.

The Algorithms - Python is an open-source collection of algorithm implementations written in Python, maintained by the TheAlgorithms organization on GitHub. The README frames the whole project as a teaching resource: the code exists to illustrate concepts, can run slower than Python's built-in equivalents, and is indexed in DIRECTORY.md for browsing. It's MIT licensed and available on GitHub.