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.

A flexible distributed key-value database that is optimized for caching and other realtime workloads.

Lightweight IoT device information storage solution: KV/IAP/LOG. | 轻量级物联网设备信息存储方案：参数存储、在线升级及日志存储 ，全新一代版本请移步至 https://github.com/armink/FlashDB

A generic dynamo implementation for different k-v storage engines

An ultra-lightweight database that supports key-value and time series data | 一款支持 KV 数据和时序数据的超轻量级数据库

An Embedded NoSQL, Transactional Database Engine

A very fast transactional key-value, embedded database storage engine in Fractal-Tree. Teaching/Research purposes only.

A high performance HTTP proxy cache server and RESTful NoSQL cache server based on HAProxy

libshmcache is a local cache in the share memory for multi processes. high performance due to read is lockless. libshmcache is 100+ times faster than a remote interface such as redis.

🏂 EJDB2 — Embeddable JSON Database engine C library. Simple XPath like query language (JQL).

★ Fullfast transactional key-value memory-mapped B-Tree storage engine without WAL ★ Surpasses the legendary LMDB in terms of reliability, features and performance. ★ Used by half of Ethereum and many other cryptocurrencies

C library of key-value data structures.

HSE: Heterogeneous-memory storage engine

Simple and fast string based key-value database with support for arrays and json

cachegrand - a modern data ingestion, processing and serving platform built for today's hardware

Multipurpose C library and persistent key/value storage

Bun is a simple to use C++ Object Database, Object Relational Mapper (ORM) and key-value library

A dictionary data type with a fast b-tree based search

B-tree generator for C

MemoraDB is a high-performance in-memory database (IMDB) designed for ultra-low latency key-value storage and operations, featuring RESP protocol compliance, atomic commands, and TTL-based expiry. Optimized for microsecond response times, it's ideal for real-time applications like caching and session stores.