List of Free Softwares in Desktop

This is the basic list of Free Softwares avaible in a GNU/Linux Distribution.

Complete Gnome App List from GNOME Website
Complete KDE App List from KDE Website

Basic Text Editor

Gedit - This is the editor comes with GNOME. It can be configured as a programmers editor using plugins
Kate - This is the editor comes with KDE. It is basicaly provide an editor framework for multiple editors
KWrite - Basic text editor with KDE. This editor uses Kate Framework.
Leafpad - Light weight text editor.

Image Viewers

Image Viewer aka The GNOME image viewer (Eye of Gnome). - this is the image viewer comes with GNOME. Website
Gwenview - Image viewer comes with KDE.
Shotwell - Features rich image viewer which allows basic photo editing.
gThumb - Image viewer and editor. Website

Web Browsers

Firefox - The default web browser for most GNU/Linux Distros. website
Web aka Gnome web - A Web browser from GNOME team based on Webkit. website
Midori - Light weight web browser. website
Chromium - Open Source project by google.

Video Players

VLC - The complete video player for Linux. Can handle almost all video formats.
SMplayer - A GUI for Mplayer
Videos - Gnome Video player
MPV Media Player - Media player using MPV framework
Parole - A Light weight media player from XFCE.

Music Players

Elisa - Music Player for KDE
Rhythmbox - Music Player for Gnome
Audacious - A minimalistic music player
Lollypop - Music Album manager and player

Office Software

Libreoffice - Fork of Open Office. Complete Office package. Text Editor, Spread Sheet Editor, Presentation Maker, Database Editor, Drawing, Math Formula Editor etc.
Onlyoffice - free software office suite developed by Ascensio System SIA, a company headquartered in Riga, Latvia.
Calligra - Office suite from KDE
Abiword - Wordprocessing Software
Gnumeric - Spreadsheet processing software

Document Viewers

Evince - Document viewer for gnome. Website
Okular - Document viewer from KDE
Foliate - A simple and modern eBook viewer
Calibre - Advanced ebook reader.
GNOME Books - Gnome based Book Manager and reader.

File Manager

Nautilus aka files - Filemanager from Gnome
Dolphin aka files - Filemanager from KDE
Thunar - File Manager from XFCE
PCMan File Manager - File manager from LXDE
XFE - Light weight fast file manager

Download Managers

Gwget
Kget
Transmission

Torrent Clients

Qbittorrent
Transmission

Screen Shot tools

Flameshot
Spectacle

Screen Recorder and Webcam

Peek - Screen recorder produce gif files. Website
Simple Screen Recorder
Cheese - Webcam player for GNOME
Kamoso - Webcam player for KDE

Note Taking App

Gnote - Gnome Note Taking App
KNotes - KDE Note Taking App
Notes - Gnome Note App
Zim - Desktop Wiki

Email App

Thunderbird
Evolution
Geary
KMail - Mail client for KDE

Communication Softwares

Element - Matrix Client with end to end encryption
Nheko - Client for Closed source Telegram Server

Mobile Remote Control

KDE Connect - Connect from Android Phone in KDE
GSConnect - Connect from Android Phone in Gnome
KORE - Remote Control for Kodi.

Calendar

Calendar - Gnome Calendar App
Planner - Calendar App

RSS Reader

Feeds - Gnome Feed Reader App
Liferea - Rss Reader
Akregrator - Rss Reader from KDE
NewsFlash - Rss Reader for Gnome
FeedReader - RSS Reader

Terminal Emulator

Gnome Terminal - Terminal app for Gnome
Konsole - Terminal app for KDE
Tilix - Tiling terminal app

Photo Editors

Darktable - RAW Image editor and photo cleaner.
Rawtherapee - RAW Image editor.
GIMP - Advanced Photo and Image editor
Krita - Photo Editor and Digital Painting software

Vector Graphics Editors

Inkscape
Karbon
Libreoffice Draw

Video Editor

KDENlive
Flowblade

Audio Editors

Audacity
Hydrogen

DTP Software

Scribus

Blender

2D Animation

Synfig Studio
Blender
OpenToonz

VFX

Blender
Natron

Text Editor

Geany
Atom
Codelite
KomodoEdit
Gnome Builder

IDE

Emacs - Spacemacs
QT Creator
Kdevelop
Neovim