Free and Open Source, Distributed, RESTful Search Engine
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Chat2DB is a free, cross-platform, local-first database client and SQL workspace for developers, DBAs, analysts, and data teams. Connect to 40+ databases, manage data, edit and run SQL, and use your own AI model to generate, explain, and optimize queries. Available on desktop, web, Docker, and CLI, with MCP support.
MyBatis SQL mapper framework for Java
- sql
- mybatis
- java
A high performance caching library for Java
🚌 The IK Analysis plugin integrates Lucene IK analyzer into Elasticsearch and OpenSearch, support customized dictionary.
- elasticsearch
- ik-analysis
- analyzer
- java
QuestDB is a high performance, open-source, time-series database
- time-series
- low-latency
- database
- sql
Apache Druid: a high performance real-time analytics database.
- druid
🔎 Open source distributed and RESTful search engine.
- search
- search-engine
- analytics
- java
Apache ZooKeeper
- zookeeper
- database
- hacktoberfest
- java
The world's fastest open query engine for sub-second analytics both on and off the data lakehouse. With the flexibility to support nearly any scenario, StarRocks provides best-in-class performance for multi-dimensional analytics, real-time analytics, and ad-hoc queries. A Linux Foundation project.
Open source transactional distributed database. Linear scalability and proven fault-tolerance on commodity hardware or cloud infrastructure without compromising performance.
A library for debugging android databases and shared preferences - Make Debugging Great Again
JanusGraph: an open-source, distributed graph database
- graph-database
- tinkerpop
- gremlin
- hbase
A scalable, distributed Time Series Database.
OrientDB is the most versatile DBMS supporting Graph, Document, Reactive, Full-Text and Geospatial models in one Multi-Model product. OrientDB can run distributed (Multi-Master), supports SQL, ACID Transactions, Full-Text indexing and Reactive Queries.
- orientdb
- graph-database
- document-database
- dbms
Distributed Peer-to-Peer Web Search Engine and Intranet Search Appliance
Apache Linkis builds a computation middleware layer to facilitate connection, governance and orchestration between the upper applications and the underlying data engines.
A graph database that supports more than 100+ billion data, high performance and scalability (Include OLTP Engine & REST-API & Backends)
- database
- graph-database
- graph
- gremlin
requery - modern SQL based query & persistence for Java / Kotlin / Android
- sql
- persistence
- java
- kotlin
Replicate your Key Value Store across your network, with consistency, persistance and performance.
An open source clone of Amazon's Dynamo.
Speedment is a Stream ORM Java Toolkit and Runtime
Apache Solr open-source search software
- lucene
- solr
- search
- nosql
Provides support to increase developer productivity in Java when using MongoDB. Uses familiar Spring concepts such as a template classes for core API usage and lightweight repository style data access.