Eclipse JDT Language Server

Lithe is a lightweight IntelliJ IDEA alternative for Java and Spring Boot development, designed to support AI-assisted coding workflows. It provides project browsing and editing, symbol navigation, search, Maven management, run configurations, breakpoint debugging, Git side-by-side diffs, local snapshot history, and database workspaces. Language servers, terminals, build tools, debuggers, and database helpers start on demand; the application also provides process-free basic completion and enables richer completion, hover, and semantic navigation through optional language services. It can detect entry points and run Spring Boot, Java, Maven, Gradle, npm, Cargo, Go, Python, Make, Docker Compose, Procfile, and shell projects. The macOS version is the current reference product, while Windows uses an independent React/Tauri implementation; both share command and contract definitions through a Rust core. It supports macOS 13 and later, Windows x64, and Java features require JDK 17 or newer.

LanguageTool is open-source proofreading software that checks spelling, grammar, and style in English, Spanish, French, German, Portuguese, Polish, Dutch, and more than 20 other languages. It detects errors that basic spell checkers may miss and can be used through a graphical interface, command line, server, HTTP API, or Java integration. The core repository is available under the LGPL 2.1 or later.

Lila is the open-source server software that powers lichess.org, developed by Thibault Duplessis (ornicar) and community contributors. The codebase is written in Scala (Play Framework) and runs on the JVM, implements real-time and correspondence chess, tournaments, puzzles, studies, user accounts, forums and a JSON API, and integrates with chess engines via the UCI protocol (commonly Stockfish) for computer play and analysis. The source is published under the GNU AGPLv3 on GitHub.

ESLint is a pluggable and configurable linter for statically analyzing JavaScript code. It identifies and reports code patterns, can automatically fix many problems with syntax-aware fixes, and supports custom parsers, preprocessing, and user-defined rules alongside its built-in rules. It can run in text editors and continuous integration pipelines, and the video identifies it as providing linting support for tsrx.

LangChain4j is a Java framework for building applications that connect language models with tools, memory, retrievers, query transformers, routers, context injectors, and content aggregators.