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Free planCode
OpenJDK.org is the official community hub for the open-source Java Platform implementation and related JDK projects. The site links active OpenJDK projects such as Amber, Loom, Panama, and Valhalla, publishes JDK build information, and hosts contribution guides, mailing lists, and source repositories.
Free tier unknownSelf-hosted AI UI
Open WebUI is a self-hosted AI platform and community hub for running chat models locally or in the cloud with Python extensions. The homepage promotes connecting Ollama, OpenAI, Anthropic, and compatible providers while keeping data on your infrastructure.
Free planWeather
Open-Meteo provides a free, open JSON weather API with high-resolution forecasts from national weather models and no API key on the public tier. Commercial customers can subscribe to dedicated capacity on customer-api.open-meteo.com with higher limits and uptime targets.
Free tier unknownAI Platform
OpenAI develops and hosts frontier AI models and developer APIs for text, reasoning, audio, and agent workflows used in ChatGPT and third-party products. The company homepage focuses on research and deployment of general-purpose AI systems with documentation and pricing for API customers.
Free tier unknownAssistant
The OpenAI API gives developers programmatic access to OpenAI models for chat, agents, tools, audio, images, and production deployments. Official documentation covers quickstarts, model catalogs, hosted agents, realtime voice, and token-based pricing for flagship and legacy models.
Free tier unknownCode
OpenAPI Designer is a browser-based tool at openapidesigner.com for working with OpenAPI specifications. The public site loads as a single-page application branded OpenAPI Designer, intended for designing and editing OpenAPI documents in the browser.
Free planAI Agents
OpenBot is a desktop workspace for running persistent AI teammates on your own computer. Agents have their own instructions, files and workspace, can exchange messages and hand off tasks, and can use a built-in browser. It connects to coding-agent providers or compatible local model endpoints while retaining the agent workspace when providers change.
Free trialDeveloper tools
OpenCage provides forward and reverse geocoding APIs and geosearch built on open data with GDPR-conscious operations. The homepage emphasizes predictable flat pricing, worldwide coverage, and developer-friendly REST endpoints trusted by thousands of teams embedding location lookup into apps.
Free tier unknownWriting
OpenClaw is an open-source AI assistant that runs on your machine and connects to chat apps such as WhatsApp and Telegram to handle inbox, email, calendar, and travel tasks. The site stresses local execution so assistants act on your behalf without a hosted-only business model.
Free tier unknownStorage
OpenCloud is an open-source file sharing and collaboration platform aimed at digital sovereignty for public sector, research, education, and enterprise teams. It advertises hyperscale-ready storage, apps, migration paths, and community-driven development.
Free planAssistant
OpenCompass is an open evaluation platform for large language and multimodal models aimed at model builders and users. The site hosts leaderboard rankings across capability dimensions, a benchmark community, and documentation for running comprehensive LLM evaluations.
Free tier unknownWriting
OpenCurriculum helps K-12 teachers plan lessons and units with curriculum mapping and alignment tools. It surfaces expert-written activities, discussion questions, and worksheets when educators need them, and offers administrator-facing workflows for school-wide curriculum coherence.
Free tier unknownVideo
OpenCut is an open-source, privacy-first video editor that runs in the browser and targets creators who want simple timelines without desktop installs. The homepage invites users to try an early beta while highlighting community contributors and a changelog.
Free tier unknownCV services
OpenCV.ai is a computer vision services firm that builds custom AI and CV solutions for startups and enterprises, covering detection, tracking, video analytics, and on-prem or mobile deployments. The site organizes offerings by algorithms, industries, and consultation-led project engagement.
Free planHealthcare
OpenELIS Global is an open-source laboratory information system for clinical, environmental, and public-health labs with FHIR-native interfaces and zero licensing fees. It supports national laboratory networks with modern security and published outcome evidence.
Free planHealthcare
OpenEMR is a widely used open-source electronic medical record and practice management suite for clinics and health systems. The project ships downloadable releases, community support channels, optional professional services, and announcements for hosted offerings.
Free planDeveloper tools
OpenFeature is a CNCF incubating open specification that standardizes vendor-neutral feature flag APIs for application code. The project homepage explains how a shared SDK surface lets teams swap flag management backends or run in-house systems without rewriting feature toggles in every service.
Free planDevOps
Opengist is a self-hosted pastebin powered by Git where each snippet is its own repository with public, unlisted, or private visibility. Users can manage snippets via the web UI, Git CLI, or HTTP/SSH pushes.
Free planIoT
openHAB is a vendor-neutral open-source home automation platform that integrates devices through pluggable bindings and rules. Homeowners and integrators run it locally to orchestrate smart devices without tying to one manufacturer cloud.
Free planAssistant
OpenHack is an AI security platform that scans codebases, verifies exploitable vulnerabilities, prioritizes findings with business context, and supports always-on AI pentesting. It combines PR security reviews, secret and supply-chain analysis, and an assistant for remediation workflows.
Free planAssistant
OpenHands is an open, model-agnostic platform for cloud coding agents. Teams run the agent locally or in OpenHands Cloud, automate PR reviews and security passes, connect GitHub and chat tools, and govern deployments with enterprise control-plane features.
Free planAssistant
OpenHuman is a free, open-source personal AI desktop app for Mac, Windows, and Linux. It keeps memory local-first, orchestrates fleets of agents, connects to apps via OAuth and MCP, and automates multi-step workflows from a single workspace.
Free tier unknownCode
Open Interpreter is an open-source coding agent designed to run low-cost and open-weight models locally or in your environment. The official site markets it as a terminal-friendly agent for executing code and automating developer tasks with accessible models.
Free tier unknownCode
OpenJML is a toolset for specifying and verifying Java and JVM programs using JML annotations and SMT-based checking. The project homepage asks whether your program does what it is supposed to do and documents OpenJML as practical formal methods tooling for Java developers.
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