BadgerDB is an embeddable, persistent, simple and fast key-value (KV) store, written purely in Go. It's meant to be a performant alternative to non Go based key-value stores like RocksDB. It is written out of frustration with existing KV stores which are either written in pure Go and slow, or fast but require usage of Cgo. Badger aims to provide an equal or better speed compared to industry leading KV stores (like RocksDB), while maintaining the entire code base in pure Go.

BadgerDB - Fast key-value store in Go.

FerretDB is an open-source proxy that translates MongoDB wire protocol queries to SQL, with PostgreSQL as the database engine.
MongoDB was initially built as open-source software and it is a game-changer for many developers, enabling them to build fast and robust applications. Its ease of use and extensive documentation made it a top choice for many developers looking for an open-source database. However, all this changed when they switched to an SSPL license, moving away from their open-source roots.
FerretDB was founded to become the true open-source alternative to MongoDB, making it the go-to choice for most MongoDB users looking for an open-source alternative to MongoDB. With FerretDB, users can run the same MongoDB protocol queries without needing to learn a new language or command.
FerretDB is a document database that uses similar commands, drivers, and tools to those of MongoDB for storing data. Unlike relational databases, which use tables, rows, and columns to define the schema of the database, document databases use key-value pairs to build the structure of a document. In FerretDB, data is stored as <a href="https://bsonspec.org/spec.html" target="_blank" rel="noopener">BSON</a> - a binary representation of JSON - so you can store more types of data than in regular JSON.
Refer to <a href="https://docs.ferretdb.io/diff/" target="_blank" rel="noopener">known differences with MongoDB</a>
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FerretDB is an open-source proxy that translates MongoDB wire protocol queries to SQL, with PostgreSQL as the database engine.

FerretDB - A truly Open Source MongoDB alternative, built on Postgres

Ristretto is a fast, concurrent cache library built with a focus on performance and correctness. Its features include Concurrency, High Hit Ratios, Fast Throughput, Cost-Based Eviction, Metrics support.

Ristretto - A high performance memory-bound Go cache

Fast, concurrent, evicting in-memory cache written to keep big number of entries without impact on performance. BigCache keeps entries on heap but omits GC for them. To achieve that operations on bytes arrays take place, therefore entries (de)serialization in front of the cache will be needed in most use cases. 

bigcache - Efficient cache for gigabytes of data written in Go.

CockroachDB is a cloud-native SQL database for building global, scalable cloud services that survive disasters.CockroachDB is a distributed SQL database built on a transactional and strongly-consistent key-value store. It scales horizontally; survives disk, machine, rack, and even datacenter failures with minimal latency disruption and no manual intervention; supports strongly-consistent ACID transactions; and provides a familiar SQL API for structuring, manipulating, and querying data.
 
CockroachDB supports the PostgreSQL wire protocol, so you can use any available PostgreSQL client drivers.

CockroachDB is a cloud-native SQL database for building global, scalable cloud services that survive disasters.CockroachDB is a distributed SQL database built on a transactional and strongly-consistent key-value store. It scales horizontally; survives disk, machine, rack, and even datacenter failures with minimal latency disruption and no manual intervention; supports strongly-consistent ACID transactions; and provides a familiar SQL API for structuring, manipulating, and querying data.

CockroachDB - Cloud-native SQL database.

immudb is a database with built-in cryptographic proof and verification. It can track changes in sensitive data and the integrity of the history will be protected by the clients, without the need to trust the server. It can operate as a key-value store or as relational database (SQL).
 
Traditional database transactions and logs are hard to scale and are mutable, so there is no way to know for sure if your data has been compromised. immudb is immutable. You can add new versions of existing records, but never change or delete records. This lets you store critical data without fear of it being changed silently.
 
Data stored in immudb is cryptographically coherent and verifiable, just like blockchains, but without all the complexity. Unlike blockchains, immudb can handle millions of transactions per second, and can be used both as a lightweight service or embedded in your application as a library. Companies use immudb to protect credit card transactions and to secure processes by storing digital certificates and checksums.

immudb is a database with built-in cryptographic proof and verification. It can track changes in sensitive data and the integrity of the history will be protected by the clients, without the need to trust the server. It can operate as a key-value store or as relational database (SQL).

immudb - world’s fastest immutable database

moss provides a simple, fast, persistable, ordered key-val collection implementation as a 100% golang library.moss stands for "memory-oriented sorted segments".

moss - A simple, fast, ordered, persistable, key-val storage library for golang

A high performance in-memory key-value item storage engine written in golang. The storage engine is based lock-free data structures and scales well with multicore CPUs.

nitro - A high performance in-memory index storage engine

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