Free codec

A codec is a device or program capable of performing encoding and decoding on a digital data stream or signal. The word codec may be a combination of any of the following: 'Compressor-Decompressor', 'Coder-Decoder', or 'Compression/Decompression algorithm'.

http://www.free-codecs.com/index.htm

open source software

Open Source Software / Free Software (OSS/FS) (also abbreviated as FLOSS or FOSS) has risen to great prominence. Briefly, OSS/FS programs are programs whose licenses give users the freedom to run the program for any purpose, to study and modify the program, and to redistribute copies of either the original or modified program (without having to pay royalties to previous developers).

http://www.opensourcewindows.org/

VideoLAN - VLC media player

VideoLAN is a software project, which produces free software for video, released under the GNU General Public License.
Learn more about the VideoLAN project.

http://www.videolan.org/

sofotex

http://www.sofotex.com/download/freeware/freeware_top20.html

topdownloads

http://www.topdownloads.net/

Also the same

http://www.softpedia.com/
http://freeware.brothersoft.com/

free download

Free download but not all freeware.
http://www.freedownloadscenter.com/

Free converter

Online converter:

Zamzar

Heywatch

few site need registration but it is free.

Freeware converter:

RivaEncoder

UltraVideo

nlite & addons

nLite allows you to customize your installation of Windows XP, Windows 2000, or Windows 2003. You can integrate service packs and hotfixes from Microsoft directly into your windows distribution files without having to re-download and install them every time you need to re-install windows.

link:
http://www.nliteos.com/guide/index.html

addons:
http://www.nliteos.com/addons/

Ccleaner

CCleaner is a freeware system optimization and privacy tool. It removes unused files from your system - allowing Windows to run faster and freeing up valuable hard disk space. It also cleans traces of your online activities such as your Internet history. But the best part is that it's fast (normally taking less than a second to run) and contains NO Spyware or Adware! )


downlink:
download_ccleaner