Font browser
FontFinder is a free and open source application for viewing and installing fonts from the Google Font Archive
KGet
KGet is a free and open source universal and convenient download manager
HBud
HBud is a free and open source simple music/video player and karaoke application
vipsdisp
vipsdisp is a free and open source program for viewing very large images
XnRetro
XnRetro is a free and open source, multiplatform program for creating images with various effects