Tech stack
36 projects use Java.
Distributed search and analytics engine with vector search
Elasticsearch is a distributed search and analytics engine for near-real-time full-text, vector, hybrid, and geospatial search.
Free universal database tool with ER diagrams, SQL editing, and data management
DBeaver Community is a free, open-source desktop tool for exploring SQL databases, with ER diagrams, a SQL editor, and table data browsing.
Open-source low-code platform for internal tools and dashboards
Appsmith is an open-source low-code platform for building internal tools, admin panels, and dashboards on databases and APIs.
Open-source identity and access management with single sign-on
Keycloak is open-source identity and access management software that adds login, single sign-on, and access control to apps and services on your own infrastructure.
Distributed event streaming for data pipelines and analytics.
Apache Kafka is an open-source distributed event streaming platform. Producers append events to durable topics that consumers read independently.
Open-source orchestration platform for scheduled and event-driven workflows as code
Kestra is an open-source, event-driven orchestration platform for building scheduled and event-driven workflows as declarative YAML flows, authored in code or a live-updating user interface.
Private messenger with end-to-end encrypted messaging and calls
Signal is a free, nonprofit messenger with end-to-end encrypted texts, calls, and group chats across Android, iOS, and desktop.
AI-powered SQL client and database workspace for 40+ databases
Chat2DB is a local-first database client that pairs a full SQL workspace with an AI assistant for generating, explaining, and optimizing queries across 40+ databases.
Video meetings with no account and no install
Jitsi Meet gets to a working video call faster than anything else: open a URL, share it, done. No accounts, no downloads, no meeting identifiers to read out.
Self-hosted ELT platform that moves data from APIs and databases into warehouses and lakes
Airbyte is a self-hosted ELT platform that moves data from APIs, databases, and files into warehouses, lakes, and AI applications through prebuilt connectors.
Open-source time-series database for fast SQL analytics
QuestDB is an open-source time-series database that ingests millions of rows per second and queries them with extended SQL over open formats.
Visual database that turns tables into collaborative apps and automations
AITable is a self-hosted visual database that pairs a spreadsheet interface with grid, gallery, kanban, calendar, and Gantt views plus a REST API.
Open-source user authentication with self-hosting and managed cloud
SuperTokens is open-source user authentication with session management, passwordless and social login, and SSO, available self-hosted or as a managed service.
Open-source grammar checker for 30-plus languages, in the browser or self-hosted
LanguageTool is an open-source grammar, spelling, and style checker for 30-plus languages, free in the browser with an optional self-hosted server.
Open-source data pipeline that ingests, transforms, and ships logs and events
Logstash is a free open-source data collection engine from Elastic that ingests, transforms, and ships logs and events through real-time pipelines.
Open-source real-time database for sub-second analytics queries
Apache Druid is a self-hosted, open-source database for real-time analytics on massive streaming and batch datasets at scale.
Apache 2.0 search and analytics suite with AI-ready retrieval
OpenSearch is an Apache 2.0 search and analytics suite for ingesting, searching, visualizing, and analyzing data at scale, with vector search for AI applications.
Free open source two-factor authenticator for Android
Aegis Authenticator is a free Android app that keeps TOTP and HOTP two-factor tokens in an encrypted vault stored on the device.
Diskless Kafka-compatible event streaming that stores data on S3.
AutoMQ is a Kafka-protocol-compatible event streaming platform that keeps its system of record on object storage such as S3 instead of broker-attached disks. Existing Kafka clients and tools connect unchanged, while compute statelessness lets clusters scale and rebalance in seconds.
Security-first diagramming online, on desktop, or self-hosted
draw.io is a free diagram editor for flowcharts, network diagrams, and whiteboards that runs in the browser, on the desktop, or self-hosted.
Self-hosted GPS tracking with live maps, geofence alerts, and trip reports
Traccar is a self-hosted GPS tracking platform that follows vehicles, assets, and phones in real time with live maps, geofence alerts, and trip reports.
Industrial IoT time-series database for edge and cloud
Apache IoTDB is an open-source time-series database for industrial IoT that collects, stores, and analyzes sensor data across edge devices and the cloud.
Real-time OLAP datastore for low-latency user-facing analytics
Apache Pinot is a real-time distributed OLAP datastore that answers SQL queries over streaming and batch data within milliseconds.
Offline maps and navigation with hiking, cycling, and driving guidance.
OsmAnd is an offline maps and navigation app built on OpenStreetMap data, with turn-by-turn voice guidance for driving, cycling, and walking.
SQL data warehouse on Hadoop for large-scale batch analytics
Apache Hive is an open-source SQL data warehouse built on Hadoop that queries large distributed datasets through HiveQL and standard JDBC and ODBC clients.
Distributed SQL database for live operational analytics
CrateDB is a self-hosted distributed SQL database for real-time analytics over time-series, JSON, full-text, vector, and geospatial data.
Open-source prototyping with built-in usability testing
Quant-UX is a free, open-source tool for building interactive prototypes, running usability tests with real users, and analyzing results with heatmaps.
Post-quantum encrypted storage, sync, and sharing you can self-host
Peergos is a peer-to-peer, end-to-end encrypted drive for storing, syncing, and sharing files, with a self-hostable open-source server.
Open-source Android app for tracking TV shows and movies
SeriesGuide is an open-source Android app that tracks TV shows and movies, syncing watched history with Trakt and listing data from TMDb.
The Advanced Open-Source Enterprise Wiki
XWiki is an open-source enterprise wiki for team knowledge bases, intranets, and documentation, with a WYSIWYG editor, rights management, and installable applications.
Open-source AI agents and workflow automation you can self-host
ByteChef is an open-source platform for building workflow automations and multi-step AI agents across the apps and databases a team already uses.
Graph-based low-code platform for building custom web apps and backends
Structr is a self-hosted low-code platform on a graph database for modeling data, APIs, pages, and workflows into custom apps.
Offline-first, privacy-respecting navigation for hike, bike, and drive.
CoMaps is a community-led offline navigation app for hiking, biking, driving, and city transit.
Self-hosted API management for gateways, Kafka streams, and AI agents
Gravitee is a self-hosted, open-source API management platform that governs REST, GraphQL, gRPC, and event-stream traffic through one policy layer and developer portal.
Open-source feedback boards with voting, roadmaps, and announcements
ClearFlask is an open-source feedback platform where customers post ideas, vote on features, and follow a public roadmap and release announcements.
Low-code platform for mobile and web apps with backend services
Convertigo is a low-code platform for building enterprise mobile and web apps with backend services.