Open-source database platforms and tools

AppwriteDatabases

Appwrite is a self-hostable backend platform providing authentication, databases, storage, functions and messaging through a unified API and SDKs.

CassandraDatabases

Apache Cassandra is an open-source, peer-to-peer NoSQL database that replicates data across nodes and datacenters with tunable consistency and no single point of failure.

ClickHouseDatabases

ClickHouse is an open-source (Apache 2.0) columnar OLAP database built for sub-second analytical queries at scale, self-hosted or via usage-based ClickHouse Cloud.

DuckDBDatabases

DuckDB is a free, open-source (MIT) in-process OLAP database you embed directly in an application, with no separate server to run or manage.

EstuaryDatabases

Estuary Flow combines change data capture (CDC), streaming, and batch ETL into one managed platform with 200+ connectors, letting teams build real-time pipelines for analytics, operations, and AI without stitching together separate tools.

InfluxDBDatabases

InfluxDB stores time-series and event data for monitoring, sensor and real-time application workloads.

MySQLDatabases

MySQL is a relational database using SQL, dual-licensed under GPL and a commercial Oracle license, with InnoDB as its default transactional storage engine.

PocketBaseDatabases

PocketBase is a lightweight, self-hosted backend that ships as one executable with an embedded SQLite database, authentication, file storage and a realtime API.

PostgreSQLDatabases

PostgreSQL is a free, open-source relational database supporting advanced SQL, native JSON storage, and extensions such as PostGIS and pgvector, maintained by a global community rather than a single vendor.

RedisDatabases

Redis is an open source in-memory data store used as a cache, session store, message broker, and vector/search engine, with Redis Cloud and Redis Software for managed or on-prem deployment.

RowyDatabases

Rowy provides a spreadsheet-style UI and low-code backend (cloud functions, APIs, scheduled jobs) built on top of your own Firebase/Firestore project, so data stays in your Google Cloud account. It's open source with a free single-project tier and paid Pro/Business plans.

SupabaseDatabases

Supabase pairs a hosted Postgres database with authentication, storage, edge functions and realtime subscriptions, and can be self-hosted or run as a managed cloud service.

ToolJetDatabases

ToolJet is an open-source (AGPL-3.0) low-code framework for building and deploying internal applications, connecting to databases and APIs, with a free self-hosted edition and paid cloud plans starting near $19/builder/month.

WeaviateDatabases

Weaviate is an open-source vector database for AI search, RAG and recommendation apps, with built-in embeddings and hybrid search, self-hosted or via Weaviate Cloud.