For developers, who are building real-time data-driven applications, Redis is the preferred, fastest, and most feature-rich cache, data structure server, and document and vector query engine.
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An open-source engine that turns continuous content streams into search and monitoring. Durable ingestion, hybrid search, alerts, and plugins for formats, models and business rules.
The open-source database for the realtime web.
Open-source vector similarity search for Postgres
- nearest-neighbor-search
- approximate-nearest-neighbor-search
📊 Cube Core is open-source semantic layer for AI, BI and embedded analytics
QuestDB is a high performance, open-source, time-series database
- time-series
- low-latency
- database
- sql
Weaviate is an open-source vector database that stores both objects and vectors, allowing for the combination of vector search with structured filtering with the fault tolerance and scalability of a cloud-native database.
- search-engine
- semantic-search
- semantic-search-engine
- vector-search
A 100% free modern JS SaaS boilerplate (React, NodeJS, Prisma). Full-featured: Auth (email, google, github, slack, MS), Email sending, Background jobs, Landing page, Payments (Stripe, Polar.sh), Shadcn UI, S3 file upload. AI-ready with tailored AGENTS.md, skills, and Claude Code plugin. One cmd deploy. Powered by Wasp full-stack framework.
- full-stack
- open-source
- saas
- nodejs
An open-source graph database
- graph
- graph-database
- cayley
- go
Next-generation full-text search library for Browser and Node.js
- search
- search-algorithm
- search-engine
- searching-algorithms
A distributed, fast open-source graph database featuring horizontal scalability and high availability
Open-source search database for full-text, vector, and hybrid search with real-time indexing and SQL.
- search-engine
- search
- mysql
- sphinxsearch
Cloud-native OSS search engine for observability
- rust
- log-management
- logs
- tantivy
Open-source, low-latency key/value engine built on Valkey with query subscriptions and hierarchical storage tiers.
OceanBase is the unified distributed database for the AI era — open-source, multi-model, one engine for your most demanding workloads.
- oceanbase
- paxos
- htap
- cloud-native
JanusGraph: an open-source, distributed graph database
- graph-database
- tinkerpop
- gremlin
- hbase
Rallly is an open-source scheduling and collaboration tool designed to make organizing events and meetings easier.
- i18next
- next-auth
- nextjs
- postgresql
Fast Open-Source Search & Clustering engine × for Vectors & Arbitrary Objects × in C++, C, Python, JavaScript, Rust, Java, Objective-C, Swift, C#, GoLang, and Wolfram 🔍
- kann
- vector-search
- approximate-nearest-neighbor-search
- simd
🔥 LimeSurvey – A powerful, open-source survey platform. A free alternative to SurveyMonkey, Typeform, Qualtrics, and Google Forms, making it simple to create online surveys and forms with unmatched flexibility.
- survey
- limesurvey
- php
- javascript
App Metrics is an open-source and cross-platform .NET library used to record and report metrics within an application.
- metrics
- dotnetcore
- health-check
- monitoring
Ech0 – An open-source, self-hosted lightweight publishing platform for personal idea sharing.
- go
- markdown
- memo
- self-hosted
Share files with your clients, from your own server. Free, open source (GPLv2), self-hosted — or use ProjectSend Cloud, the official hosted version run by the same team.
- projectsend
- file-sharing
- clients-oriented
- php
Sync-in · Sovereign platform for file storage, sharing, synchronization, and collaboration.
- self-hosted
- cloud-alternative
- collaboration
- collaborative-editing
Versioned, fast, distributed Datalog engine for everyone.
- datahike
- datalog
- database
- clojure