MPlayer Portable is the popular MPlayer media player packaged as a portable app, so you can take your video files along with everything you need to play them on the go. You can place it on your USB flash drive, iPod, portable hard drive or a CD and use it on any computer, without leaving any personal information behind.
VirtualDub Portable is a video capture/processing utility. It lacks the editing power of a general-purpose editor such as Adobe Premiere, but is streamlined for fast linear operations over video. It has batch-processing capabilities for processing large numbers of files and can be extended with third-party video filters. VirtualDub is mainly geared toward processing AVI files, although it can read (not write) MPEG-1 and also handle sets of BMP images.
Eraser Portable is a secure data removal tool that runs directly from your iPod, USB thumbdrive, portable hard drive or any other portable media. You can plug it right into any Windows computer and use it just like you would on your own. It is a repackaged version of the popular Eraser utility designed with portability in mind, so it has all the same great features of Eraser, but there's nothing to install.
VLC media player is a highly portable multimedia player for various audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, XviD, WMV, mp3, ogg, ...) as well as DVDs, VCDs, and various streaming protocols. It can also be used as a server to stream in unicast or multicast in IPv4 or IPv6 on a high-bandwidth network.