List of free nosql stuff for developerππ½
If you're looking for all programming tools around nosql (not just free). Check this page List of nosql Programming Tools

Table plus
Modern, native client with intuitive GUI tools to create, access, query & edit multiple relational databases: MySQL, PostgreSQL, SQLite, Microsoft SQL Server, Amazon Redshift, MariaDB, CockroachDB, Vertica, and Redis.
Tag: database-gui, mysql, nosql
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25 GB of Storage 25 provisioned Write Capacity Units (WCU) 25 provisioned Read Capacity Units (RCU) Enough to handle up to 200M requests per month.
HeidiSQL - MariaDB, MySQL, MSSQL, PostgreSQL and SQLite made easy
HeidiSQL is a free and powerful client for MariaDB, MySQL, Microsoft SQL Server, PostgreSQL and SQLite
Tag: database-gui, sql, nosql
Open Source Only for Windows
Beekeeper Studio
The smoothest, best looking, and easiest to use SQL client for CockroachDB, MariaDB, Microsoft SQL Server, MySQL, Postgres, Amazon Redshift, and SQLite
Tag: database-gui, mysql, nosql
Open source Multiplatform support, available for Windows, MacOS, and Linux

Robo3T
Robo 3T (formerly Robomongo) is the free, lightweight, open-source MongoDB GUI with an embedded mongo shell, real auto-completion, and support for MongoDB 4.0.
Tag: database-gui, nosql
Open source

Azure Cosmos DB
Build applications on a fully managed, multi-master non-relational database service that offers support for NoSQL database APIs.
Tag: nosql, database
Always: 1000 request units/s with 5 GB storage
1 Year: 400 request units/s with 25 GB storage