3,993 tools
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 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 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 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.
Free planDeveloper tools
The welcome page highlights Canvas and WebGL rendering, mobile support, and compatibility with OSM, Bing, Mapbox, Stadia, and OGC services under a BSD license.
Free planStorage
OpenMediaVault is a Debian-based network attached storage OS with services such as SMB, FTP, RSync, and plugin extensions. It targets home labs and small offices that want NAS administration without deep Linux expertise.
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 planInfrastructure
OpenMeter by Kong is usage-metering and billing software aimed at AI and API companies that need to turn events, logs, and metrics into billable usage. The homepage highlights real-time metering, product catalog management, entitlements, and Stripe sync for usage-based pricing without rebuilding metering infrastructure from scratch.
Free planNLP
Apache OpenNLP is a Java machine learning toolkit for natural language processing tasks such as tokenization, sentence segmentation, tagging, parsing, and named entity recognition. It ships models, Maven integration, and documentation for embedding NLP pipelines.
Free trialResearch
OpenObserve is an open-source observability platform for logs, metrics, traces, RUM, session replay, and error tracking. The vendor markets cloud and self-hosted deployments with pay-as-you-go ingestion pricing, high compression versus Elasticsearch, and optional enterprise features such as SSO and AI-assisted observability.
Free planCode
OpenProse is an open contract-authoring standard for expressing agent intent through composable requirements in Markdown. It treats contract authoring as the next step beyond prompt and context engineering, supplying reusable building blocks, source grounding, and MIT-licensed specifications agents can execute.
Free to startIoT Platform
OpenRemote is a fully open source IoT device management platform for manufacturers and system integrators. It connects devices and data sources into one manager interface, supports automation rules and scripting, and provides dashboards and maps for monitoring fleets, buildings, energy systems, and other distributed assets at scale.
Free planMapping API
OpenRouteService provides free, open source geospatial routing and analysis APIs built on OpenStreetMap data. Services include directions, isochrones, time-distance matrices, geocoding, points of interest, elevation, and optimization, with SDKs and an interactive API playground for developers and humanitarian use cases.
Free to startSearch
OpenSearch is a community-driven, open-source search and analytics suite for ingesting, searching, visualizing, and analyzing data. The project includes OpenSearch Core, OpenSearch Dashboards, and Data Prepper, with plugins for vector search, observability, security analytics, and machine learning under the Apache 2.0 license.
Free tier unknownCode
OpenSFTP is a cross-platform SSH and SFTP client marketed as an integrated workspace with bookmarks, terminal, filesystem browser, and GPT Copilot assistance. The homepage highlights Windows, macOS, and Linux downloads from YiiDuo Technology.
Free to startVoIP
OpenSIPS is a mature open source SIP server and application platform for voice, video, IM, and presence services. It provides a modular, scriptable routing engine aimed at carrier-grade performance, with documentation, benchmarks, monitoring interfaces, and a web configuration UI for VoIP architects and operators.
Free to startTransit
OpenTripPlanner is an open source family of projects for multimodal passenger information and transportation network analysis. Its Java server builds itineraries combining transit, walking, bicycling, and driving using OpenStreetMap and GTFS data, exposed through web APIs and client libraries used by regional journey planners worldwide.
Free planGaming
OpenTTD is an open source simulation game based on Transport Tycoon Deluxe that recreates and extends the classic transport-building gameplay. It adds larger maps, stable multiplayer for many players, dedicated servers, IPv6 support, NewGRF customization, and numerous quality-of-life tools under the GPL v2 license.
Free tier unknownResearch
OpenVAS is the Open Vulnerability Assessment Scanner maintained in the Greenbone ecosystem for finding security issues in networks and hosts. The openvas.org site introduces OPENVAS by Greenbone as a vulnerability scanner project with links to Greenbone community and commercial offerings.
Free planCode
OpenVDB is an open-source C++ library and file format for efficiently storing and manipulating sparse volumetric data such as smoke, fire, and other FX volumes. The project site welcomes visitors to documentation, downloads, and community resources for integrating OpenVDB into DCC tools and renderers.
Free planMessaging API
OpenWA is a free, open source, self-hosted WhatsApp HTTP API gateway for developers who want full control of messaging infrastructure. It provides REST endpoints, multi-session support, webhooks, a web dashboard, pluggable databases and storage, optional Redis queues, and swappable WhatsApp engines without vendor lock-in.
Free planCode
OpenWebhook provides a free webhook tester and inspector plus optional OpenWebhook Pro for permanent endpoints. The service captures HTTP requests in real time, exposes headers and payloads, supports forwarding to multiple HTTPS destinations, and offers CLI and MCP integrations for coding agents.
Free planInfrastructure
Apache OpenWhisk is an open-source serverless platform that runs functions in response to triggers from HTTP requests, feeds, or scheduled rules. The project packages actions in containers, exposes a REST API and wsk CLI, and supports multiple language runtimes so teams can self-host event-driven workloads at scale.
Free tier unknownCode
Openwork runs a crew economy where AI Claws execute missions and human Pilots oversee them on Base. Participants deploy agents, compete in hackathons, and earn $OPENWORK tokens while the marketplace API supports competitive bidding with on-chain escrow.
Showing 2,952 of 3,993 tools
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