DB Browser - tool for databases.

Also is a good tool for learning and test database queries.
About this tool the development team tells us:

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

Under Fedora distro, the package is named: SQLite browser.
To install it just use this:

$ sudo dnf install sqlitebrowser

You can use also with this OS: Windows, macOS X, OSX 10.8 (Mountain Lion) - 10.12 (Sierra), Linux (Arch Linux, Fedora and Ubuntu, and Derivatives).

Frogatto new game crossplatform...

A new game is very nice and interesting. Named "Frogatto", this game should replace some older games from gnome.
Frogatto is freely available for Mac, Windows, and Linux.
Download it.