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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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CouchDB
Seamless multi-master syncing database with an intuitive HTTP/JSON API, designed for reliability
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buntdb
BuntDB is an embeddable, in-memory key/value database for Go with custom indexing and geospatial support
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
couchdb, is an old favourite of mine. https://github.com/jo/couchdb-best-practices
If you want some "developer experience", look at https://gorm.io/
I've heard people recommend CouchDB, no personal expience though. It is also nosql, somewhat similar to mongo. The selling feature is easy scalability. I'm planning to take a weekend to try it out myself. https://couchdb.apache.org/
SQLite for SQL
BuntDB for NoSQL
Ferret DB https://www.ferretdb.io/ a Mongodb protocol translation layer on postgres,, designed to be a drop in replacement for Mongodb
There is Genji, this is a document-oriented embedded SQL database written in Go. It's still a work in progress though, but it looks great!
FWIW https://tailscale.com runs their entire system on SQLite and they are not a small project.