Video players: vlc, smplayer, gnome-mplayer, mpv, xine.
Video Editors: handbrake, winff, devede.
Screen Recorders: vokoscreen, recordmydesktop.
Webcam Application: guvcview, cheese.
Audio players: audacious, amarok, exaile, clementine, banshee, decibel-audio, kscd.
CD Audio Rippers: asunder, audex, ripperx.
Audio File Converters: soundKonverter, soundConverter.
Audio File Volume & Tags Editors: easymp3gain, qtgain, audacity, easytag, tagtool.
Web Browser: iceweasel.
Iceweasel (Firefox) Favorite Add-Ons: http://i66.tinypic.com/jpiogp.png
PDF & Image Viewer: okular, gwenview, gpicview.
Images & Digital Camera Managers: digikam, shotwell, fotowall, gimp.
Image Scanning Applications: simple-scan, Xsane, skanlite.
Burning Software: K3b, Xfburn, Brasero.
Torrents Managers: Qbittorrent, Ktorrent, Transmission.
Windows API implementation Software: wine, (playonlinux, winetricks).
System Info & Process Viewer: sysinfo, hardinfo, inxi, screenfetch, htop.
IRC Client: hexchat.
Internet Messenger: pidgin.
Office Software: libreoffice.
Personal Organizer: osmo.
Partition Editor: gparted, gnome-disk-utility.
Terminal: yakuake, konsole (kde), sakura.
S.M.A.R.T. Hard Disk Health Inspector: gsmartcontrol, gnome-disk-utility.
Disk Space Information Utility: kdf, filelight.
Labels & Business Cards Designer: glabels.
Unnecessary File Cleaner: bleachbit.
User Manager: kuser (kde).
Unit Converter: convertall.
Subtitle Editor & Download/Upload Manager For Video Files: gnome-subtitles, subdownloader.
I think that's all... for now