1,919 tools
Free planSoftware & utilities
Offen Fair Web Analytics is an open-source, self-hosted web analytics package that encrypts usage data end-to-end and gives visitors access to their own records. Site owners gain aggregate insights while relying on opt-in consent and first-party cookies.
Free trialSoftware & utilities
Oh Dear is website health monitoring that checks uptime every minute alongside SSL certificates, DNS, cron jobs, broken links, and performance metrics with status pages. The homepage sells an all-in-one monitoring suite for teams who want broad coverage without stitching many single-purpose tools.
Free planSoftware & utilities
OmniTools is a browser-based toolkit of utilities for editing images, text, lists, audio, video, PDFs, and structured data without installing desktop apps. The English site copy highlights thousands of quick tools searchable from one interface.
Free tier unknownSoftware & utilities
Onboard.io is customer onboarding software for B2B success teams, replacing spreadsheet chaos with templated launch plans, customer portals, KPI dashboards, and CRM integrations. Plans add seats, unlimited projects, workflows, SSO, and executive reporting at higher tiers.
Free planSoftware & utilities
Onetime Secret shares passwords and other sensitive text through links that self-destruct after viewing or expiry. The service supports hosted regional sites, custom domains, email delivery, REST API access, and self-hosted deployments.
Free planSoftware & utilities
Onloc is a self-hosted device tracking stack with an Android app for live location, history, and remote commands such as ring or lock. Operators host their own server to keep location data under their control.
Free planSoftware & utilities
ONLYOFFICE DocSpace is a document collaboration platform with rooms for files, real-time co-editing, and cloud or on-premise deployment. The vendor also sells Workspace bundles with Docs, Mail, Groups, and Talk for organizations.
Free tier unknownSoftware & utilities
Ontop provides global hiring and payroll infrastructure so companies can contract or employ talent in 150+ countries while workers receive pay through Ontop wallet and card products. Pricing advertises transparent monthly fees for contractor-of-record and blended contractor-plus-employee setups.
Free tier unknownSoftware & utilities
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 planSoftware & utilities
Open Archiver is an open-source, self-hosted email archiving platform for Google Workspace, Microsoft 365, and IMAP sources with full-text search across messages and attachments. An Enterprise Edition adds compliance controls such as retention policies and audit logging.
Free tier unknownSoftware & utilities
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 unknownSoftware & utilities
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 planSoftware & utilities
Open eClass is a free, open-source e-learning platform from GUnet for courses, assignments, quizzes, learning paths, multimedia, and statistics. Institutions can download releases, customize the PHP codebase, and offer responsive or mobile access.
Free planSoftware & utilities
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 planSoftware & utilities
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 planSoftware & utilities
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 planSoftware & utilities
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 planSoftware & utilities
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 planSoftware & utilities
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 planSoftware & utilities
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 planSoftware & utilities
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 planSoftware & utilities
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 to startCoding & development
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 planSoftware & utilities
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.
Showing 1,344 of 1,919 tools
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