SoyCuyaNews
(spanish, funny)

Palabras Textuales
(spanish, design, funny)

Inkscape
(open source, SVG)

7-zip
(free zip/rar utility)

Audacity
(free, music editor recorder)

FileZilla
(free, FTP client)

Foxit
(free, small, fast, PDF reader)

Mplayer
(incredible must have, free, small, versatile, with very useful controls movie player)