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A little curiosity. A world of open source.
THE FIRST COLLECTIONetcd is a distributed, reliable key-value store written in Go that uses the Raft consensus algorithm for highly available replicated logs. It offers a simple gRPC API, TLS security, and is widely used in production for critical distributed system data, notably with Kubernetes.
Redis is an open-source in-memory data structure server used as a cache, NoSQL database, message broker, search and vector query engine. The README covers key use cases, data types, client libraries, quick start, and source build instructions.
immudb is an open-source immutable database with built-in cryptographic proof and verification. It supports SQL, key-value, and document models, keeps a tamper-proof history of every change, and speaks the PostgreSQL wire protocol.
Dragonfly is an in-memory data store presented as a modern Redis and Memcached replacement. It aims for API compatibility, high throughput, lower resource use, and features such as a shared-nothing architecture, adaptive caching, and fork-less snapshots.
FrogDB is a pre-release, Redis 8.0-compatible, memory-first database written in Rust. It speaks RESP2/RESP3 for drop-in use with existing Redis clients and provides core and module-style data types, JSON, time series, vector and full-text search, Raft-based clustering with read replicas, and RocksDB-backed persistence.
MMKV is an efficient, small key-value storage framework from WeChat, using mmap and protobuf. It runs on Android, iOS/macOS, Windows, POSIX, HarmonyOS NEXT, with experimental Kotlin Multiplatform support.
