LanguageTool

Lexicon is a free, open-source, local-first writing assistant and distraction-free rich-text editor for Windows, macOS, and Linux. It provides inline proofreading through the separate LanguageTool engine, while local AI tools handle rewriting, tone adjustment, summarization, and other writing tasks without requiring an account or cloud writing service. Users can review suggestions in a dedicated panel, format drafts with rich text and LaTeX, autosave work, and export it to Markdown, HTML, text, or PDF. The app can download and run a local AI model or use an existing local Ollama server; the editor and proofreading tools work without an AI-model download. It is MIT-licensed, and the repository notes that its Windows builds are unsigned and its macOS build is pre-release and unsigned.

Eclipse JDT Language Server (eclipse.jdt.ls) is the Eclipse Foundation's Java language server that implements the Language Server Protocol to provide Java editing features such as semantic navigation (go-to-definition), code completion, diagnostics, refactorings, formatting, and code actions. It is maintained by the Eclipse JDT project, distributed under the Eclipse Public License, runs on the JVM, and can be used with any LSP-compatible editor or IDE.

sloptrim is a local prose linter and coding-agent plugin that detects patterns associated with AI-generated writing when an agent saves a document. It extracts prose from supported text and office formats, scores it on a 0–100 scale, and reports suspicious spans for revision; it analyzes writing patterns rather than determining authorship and does not process code. The command-line tool uses Python's standard library, requires no model or network connection, and keeps text on the local machine. It integrates with Claude Code and can be initialized for other agents through an agent contract and editor-rule files.

A heuristic text linter based on ASD-STE100 Simplified Technical English. Its mechanical checks score violations per hundred words, including words per sentence, semicolons, passive voice, phrasal verbs, and marketing adjectives. It is included in a kit with an agent skill and Claude Code hooks for checking text before and after model-generated replies; the kit describes the linter as covering the machine-checkable subset of the standard.

LangBot is an open-source platform for building and operating AI-powered instant-messaging bots. It connects large language models to platforms including Discord, Telegram, Slack, LINE, QQ, WeChat, WeCom, Lark, DingTalk, KOOK, and Matrix, supporting multi-turn conversations, tool calling, multimodal input, streaming output, and agent workflows. The platform includes a built-in retrieval-augmented generation knowledge base, integrations with systems such as Dify, Coze, n8n, Langflow, and Deerflow, and an event-driven plugin system with MCP support. A browser-based management panel configures, manages, and monitors bots, while its multi-pipeline architecture supports separate bot workflows and operational monitoring. LangBot can be run through LangBot Cloud, a one-line uvx launch, Docker Compose, or other deployment methods. It also exposes an MCP endpoint that mirrors its HTTP API for programmatic management of bots, pipelines, plugins, and models.