Self-hosted projects using Java

OpenTripPlanner (OTP) is an open source multimodal routing engine that builds networks from GTFS and OpenStreetMap to produce itineraries and real-time transit trip plans...

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ArcGIS Online+2

Peergos is a peer-to-peer encrypted file storage and private social platform with fine-grained access control, capability links, and a web UI for secure sharing.

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Proton Drive+12

Docspell is a self-hosted document management system that imports scanned files and email attachments, runs OCR, and helps organize documents with tags, metadata, and sea...

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DocuWare+5

OpenRouteService is an open-source REST API providing routing, isochrones, matrices, geocoding, POIs, elevation and vehicle-optimization services built from OpenStreetMap...

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NextBillion.ai Directions API

Self-hosted personal location tracking and analysis tool that turns GPS data into timelines, trips, visits, and significant places with multi-user support.

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Strava+2

OpenRemote is a 100% open-source IoT platform for device management, data dashboards, and automation with rules, APIs, and multi-tenant user management.

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ThingsBoard Cloud+13

Scalable enterprise search platform supporting full-text, vector, faceted and geospatial search with SolrCloud clustering and a web admin UI.

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Algolia+18

Alf.io is an open source ticket reservation and event attendance management system for conferences, workshops, meetups, and trade shows.

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Eventbrite+19

Open-source low-code platform to build internal tools and customer-facing web apps with a visual UI builder, reusable modules, data-source connectors, and RBAC.

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Retool+13

Lightweight clipboard sync tool for Windows, macOS, Linux, and Android with end-to-end encryption, multi-user support, and optional self-hosted server or P2P mode.

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Pushbullet+6

Enterprise-grade open-source wiki platform for knowledge management, intranets and web applications.

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Atlassian Confluence+15

Gerrit Code Review is a web-based code review and workflow tool for Git that supports inline comments, access controls, and integrated Git hosting via SSH/HTTPS.

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Gerrit Code Review+8

Hyphanet (formerly Freenet) is a peer-to-peer platform for censorship-resistant communication and publishing using an encrypted, decentralized data store and plugin-based...

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Mastodon (mastodon.social)+8

openHAB is a Java-based, modular open-source smart home platform providing a rules engine, extensible add-ons, multi-protocol device integration and mobile/web UIs.

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Samsung SmartThings+15

Fess is an open-source enterprise search server with a built-in crawler, web-based administration, and OpenSearch/Elasticsearch-backed full-text search.

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Glean+9

DSpace is an open source institutional repository and digital asset management system for preserving, managing, and providing access to digital content.

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DSPACE Direct+19

Apache OFBiz is a Java-based open-source ERP and e-commerce framework providing modular apps for accounting, CRM, order management, inventory and manufacturing, plus deve...

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Odoo+19

Open source Stack Overflow clone for teams: Q&A, knowledge sharing, search, spaces, reputation, webhooks, and integrations via a Para backend.

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Stack Overflow+18

Self-hosted YouTube-to-podcast converter that generates API-key-protected RSS feeds, auto-syncs new uploads, and downloads audio or video for any podcast client.

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FreeTube+5

DavMail is a Java gateway that lets standard clients use IMAP/POP/SMTP, CalDAV, CardDAV, and LDAP with Microsoft Exchange and Microsoft 365 via OWA/EWS.

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Proton Mail Bridge

Apache OpenMeetings is a web conferencing and collaboration platform with video meetings, chat, whiteboards, screen sharing, recording, file sharing, and user/room manage...

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Zoom+11

Para is an open-source, Java-based multitenant backend framework providing a RESTful JSON API, full-text search, distributed caching, and flexible authentication for web,...

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Firebase+8

Docker-ready, open-source computerized maintenance management system with web and mobile apps for work orders, preventive maintenance, inventory and analytics.

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UpKeep+8

Feedback management and public roadmap platform for collecting, prioritizing and sharing customer requests; supports Docker, Helm/Kubernetes and multiple storage backends...

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Canny+6

Open-source Java LMS for course authoring, assessments and institutional learning management with SCORM/QTI support and REST API.

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Canvas LMS+14

QuickDrop is a Spring Boot app for anonymous, chunked file uploads with optional encryption, per-file passwords, token share links, previews and an admin console.

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WeTransfer+19

Self-hostable Pastebin alternative for sharing and storing code snippets, files, and rich previews with API, OAuth login, folders, and previews for many formats.

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SourceForge+2

Scalable, modular XMPP/Jabber server written in Java supporting TCP, BOSH, WebSockets, federation, components, HTTP API and push notifications.

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Skype+12

Java-based, modular digital repository for libraries and archives. Provides a RESTful HTTP API, Linked Data support, flexible storage backends and preservation features.

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DSPACE Direct+13

HabitSync is a self-hosted PWA habit tracker offering goals, challenges, social sharing, OIDC SSO, Apprise notifications, API-first design, and a mobile app.

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Habitica+9