It's easy to use and even easier to install/uninstall.
ImTOO Software Studio
Convert videos in almost any format even high-definition (HD) to 3GP with ease.
Convert your video files to 3GP format with excellent output quality.
It enables you to convert between various video formats.
AVN Media Technologies
Versatile video conversion tool with support for most popular video codecs.
This is a 3GP video converting tool for mobile phone users.
Codecs included movie player plays videos without searching for codecs.
Xiph.Org Open Codecs - most complete implementation codecs for Windows.
Shark007 Advanced Codecs provides a collection of codecs for Windows users.
MediaSanta Software Inc
Allows you to convert 3GP to 3GP, 3GP to AVI, 3GP to MP4 and 3GP to DVD.
3GP converter, AVI MPEG to 3GP, rm to 3gp, rmvb to 3gp converter.
It can convert AVI to 3GP, MPEG to 3GP ,MPG to 3GP and MP4 to 3GP.
Mythbuntu is a community supported add-on for Ubuntu.
cd2usb by hacktolive is a windows program, designed to make Live USBs of Ubuntu.
CASLab Linux is a computer operating system based on the Ubuntu.
Lubuntu is a flavor of Ubuntu based on the Lightweight X11 Desktop Environment.