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15,347 tools

Free plan

OpenLayers3

Developer 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
  • API unknown
  • Checked Oct 4, 2026
Facts sourced
Free plan

OpenLLMetry

Assistant

Developers add a few lines of code to trace model calls and route telemetry to more than 25 supported observability backends.

  • Free
  • API available
  • Checked Oct 4, 2026
Facts sourced
Free plan

OpenMediaVault

Storage

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
  • API unknown
  • Checked Oct 4, 2026
Facts sourced
Free plan

OpenMeter

Infrastructure

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
  • API available
  • Checked Oct 4, 2026
Facts sourced
Free plan

OpenNLP

NLP

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
  • API unknown
  • Checked Oct 4, 2026
Facts sourced
Free plan

OpenNMT-py

Voice

OpenNMT is an open-source neural machine translation ecosystem maintained by SYSTRAN and Ubiqus. OpenNMT-py provides a PyTorch implementation for training and serving NMT and related sequence models, alongside companion projects for efficient inference and tokenization.

  • Free
  • API unknown
  • Checked Oct 4, 2026
Facts sourced
Free trial

openobserve.ai

Research

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.

  • Not listed
  • API unknown
  • Checked Oct 4, 2026
Facts sourced
Free tier unknown

OpenOLAT

Education

OpenOlat is a learning management system from frentix for companies, schools, and universities with course design, eTesting, web conferencing, evaluations, and integrations. Customers can choose hosted OpenOlat or open-source deployment with professional services.

  • Not listed
  • API unknown
  • Checked Oct 4, 2026
Facts sourced
Free plan

OpenOlitor

Agriculture

OpenOlitor is open-source software backed by a Swiss association to help community-supported agriculture (CSA) groups manage members, deliveries, and subscriptions. Modules cover production planning, billing, and communication for food collectives.

  • Free
  • API unknown
  • Checked Oct 4, 2026
Facts sourced
Free plan

OpenPPC

Advertising audit infrastructure

OpenPPC computes Google Ads audit figures from exported CSV reports and checks numbers in an AI-written audit against that data. It offers a local browser tool and read-only MCP tools, allowing an assistant to obtain computed evidence rather than inventing campaign metrics.

  • Free
  • API available
  • Checked Oct 7, 2026
Facts sourced
Free plan

OpenProject

Project management

OpenProject is open-source project management software supporting classic, agile, and hybrid workflows with tasks, Gantt charts, boards, time tracking, and team collaboration. Teams can self-host the Community edition or buy cloud Enterprise support tiers.

  • Free
  • API unknown
  • Checked Oct 4, 2026
Facts sourced
Free plan

OpenProse

Code

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
  • API unknown
  • Checked Oct 4, 2026
Facts sourced
Free plan

OpenRefine

Research

OpenRefine is a free, open-source desktop tool for cleaning, transforming, and reconciling messy tabular data. It helps analysts explore large spreadsheets, apply repeatable transformation recipes, cluster similar values, and link rows to external knowledge bases without requiring a proprietary cloud account.

  • Free
  • API unknown
  • Checked Oct 4, 2026
Facts sourced
Free to start

OpenRemote

IoT 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.

  • Not listed
  • API available
  • Checked Oct 4, 2026
Facts sourced
Free tier unknown

Openroll

Assistant

Openroll is an AI workforce platform for people and finance teams backed by Y Combinator. It connects to HR and finance systems, runs compensation, headcount, and budgeting analyses with audit trails, and automates recurring operational workflows from natural-language requests.

  • Not listed
  • API unknown
  • Checked Oct 4, 2026
Facts sourced
Free plan

OpenRouter

Model router

OpenRouter is a unified API and chat interface that routes prompts across hundreds of AI models and providers with activity logging and optional enterprise controls. The homepage invites developers to compare models and prices while choosing Free, Standard, Business, or Enterprise workspaces.

  • Free
  • API available
  • Checked Oct 4, 2026
Facts sourced
Free plan

OpenRouteService

Mapping 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
  • API available
  • Checked Oct 4, 2026
Facts sourced
Free to start

OpenSearch

Search

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.

  • Not listed
  • API available
  • Checked Oct 4, 2026
Facts sourced
Free tier unknown

OpenSFTP

Code

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.

  • Not listed
  • API unknown
  • Checked Oct 4, 2026
Facts sourced
Free plan

OpenSign

E-Signature

OpenSign is an open source PDF e-signature platform positioned as an alternative to commercial signing tools. It offers unlimited free signatures, multi-party signing, completion certificates with access logs, secure document storage in OpenSign Drive, self-hosting, and developer API documentation from OpenSign Labs.

  • Free
  • API available
  • Checked Oct 4, 2026
Facts sourced
Free to start

openSIPS

VoIP

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.

  • Not listed
  • API unknown
  • Checked Oct 4, 2026
Facts sourced
Free plan

OpenSKY Network

Research

OpenSky Network is a nonprofit research platform that collects and publishes open air-traffic sensor data including ADS-B, Mode-S, ADS-C, FLARM, and VHF feeds for aviation research. The site offers live maps, historical databases, scientific datasets, and API access so universities and analysts can study global flight patterns.

  • Free
  • API available
  • Checked Oct 4, 2026
Facts sourced
Free plan

OpenSpec

Assistant

OpenSpec is a lightweight, configurable spec framework for software teams and coding agents. It helps groups capture living specifications, refine requirements, validate intent, and verify implementations stay aligned as code evolves.

  • Free
  • API unknown
  • Checked Oct 4, 2026
Facts sourced
Free plan

opensrc

Assistant

It supports npm, PyPI, crates.io, and GitHub registries through opensrc path subshells compatible with ripgrep and cat.

  • Free
  • API unknown
  • Checked Oct 4, 2026
Facts sourced

Showing 10,752 of 15,347 tools

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