Which apps read/write an SQLite 3 database in Ubuntu?

Have an app on another device which exports an SQLite v3 database. I wish to read and alter the content of that .db file. Tried Libre Office Base, no joy. Which apps will read that .db file, and edit it? Hoping for a GUI app.

Try DB Browser for SQLite. From the site:

DB Browser for SQLite is a high quality, visual, open source tool to create, design, and edit database files compatible with SQLite.

It is for users and developers wanting to create databases, search, and edit data. It uses a familiar spreadsheet-like interface, and you don't need to learn complicated SQL commands.

Controls and wizards are available for users to:

• Create and compact database files
• Create, define, modify and delete tables
• Create, define and delete indexes
• Browse, edit, add and delete records
• Search records
• Import and export records as text
• Import and export tables from/to CSV files
• Import and export databases from/to SQL dump files
• Issue SQL queries and inspect the results
• Examine a log of all SQL commands issued by the application

Install with sudo apt install sqlitebrowser

There is an application in the repositories for Ubuntu versions before 18.04 called sqliteman. It is listed in those repositories as "GUI tool for SQLite3 admin and developers alike".

I haven't used it much but it seems like it's a readily available GUI tool in the repositories. If you are using a version of Ubuntu earlier than 18.04, you can install it with apt-get install sqliteman.