Checksumo
Checksumo – free and open source, simple application for verifying specified file against given hash for Linux
MKVToolNix
MKVToolNix is a free and open source, multi-platform, universal and powerful set of tools for working with MKV format files
Avidemux
Avidemux is a free and open source, multi-platform video editor designed for simple tasks: cutting, filtering and encoding
youtubedl-gui
youtubedl-gui is a free and open source, easy-to-use graphical interface for youtube-dl
Master PDF Editor
Master PDF Editor is a free and multi-platform, easy-to-use, but powerful and multifunctional program for working with PDF documents
Kdictionary
Kdictionary is a free and open source powerful offline/online dictionary
ONLYOFFICE Desktop Editors
ONLYOFFICE Desktop Editors – free and open source, cross-platform office suite for editing documents, tables and presentations
LibreOffice
LibreOffice is a free and open source, multiplatform powerful office suite, which allows you to work with text, spreadsheets, presentations and others
Pixelitor
Pixelitor is a free and open source, multi-platform advanced image editor with support for layers, filters, cropping and other functions