There are 2 repositories under document-oriented topic.
Schema-free, document-oriented streaming database that optimized for monitoring network traffic in real-time
Very simple read/write database with a No-SQL. It's written in JavaScript using pure Node.js API and pretty easy and small.
Reindexer library for Rust
The Jazz Database which Stores Documents in Files and Supports Version Control and Sharing
Clorastore is the world's 2nd easiest document-oriented NoSQL database followed by the CloremDB for android. This is similar to Cloud firestore and MongoDB and is written in java
Document Oriented Database Built Using Python.
Using a MongoDB for storing the scraped data
Fault-tolerant distributed cache