Screenshot tool

Spectacle – free and open source, simple software for creating screenshots from the KDE project for Linux

Shutter – free and open source, multifunctional program for creating and editing screenshots

ScreenCloud – free anp open source, simple software for creating and sharing screenshots

Flameshot – free and open source, powerful yet simple screenshot creation software that lets you edit and upload screenshots

Ksnip – free and open source, cross-platform software for creating and editing screenshots