Red Hat Enterprise Linux / CentOS Linux Enable EPEL (Extra Packages for Enterprise Linux) Repository

EPEL (Extra Packages for Enterprise Linux) is a volunteer-based community effort from the Fedora project to create a repository of high-quality add-on packages that complement the Fedora-based Red Hat Enterprise Linux (RHEL) and its compatible spinoffs, such as CentOS and Scientific Linux.
EPEL provide lots of packages for CentOS / RHEL, It is not part of RedHat or CentOS but is designed to work with these major distributions. Please note that EPEL only provides free and open source software unencumbered by patents or any legal issues. In short you will not find mp3, dvd and music / media player under EPEL. However, you will find many programs related to networking, monitoring, sys admin, programming and so on.
Packages are supplied in RPM format and in most cases are ready to use. Beware that some packages may break something and you should not blindly install those packages.
To enable EPEL for CentOS 5
For 32-bits
# wget http://download.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm
For 64-bits
# wget http://download.fedoraproject.org/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm
To enable EPEL for CentOS 4For 32-bits
# wget http://download.fedora.redhat.com/pub/epel/4/i386/epel-release-4-10.noarch.rpm
For 64-bits
# wget http://download.fedora.redhat.com/pub/epel/4/x86_64/epel-release-4-10.noarch.rpm

Dropbox

Dropbox Website

Free Online Storage which provide 1GB of free space. It has client programs for uploading, syncing between different computers, independent of the OS. Pretty neat and interact with the Client Desktop quite seamlessly.

For Windows, LINUX and MAC

Adding Swap File without rebooting

Sometime we will need to increase swap file beyond the initial allocation. To achieve there, see this article from CentOS 5 Documentation (Adding Swap Space) and (Removing Swap Space)

Another Good article with more in-depth explanation on the various command (http://www.linux.com/feature/113956)

SliTaz - one fo the smallest LINUX Distribution < 30MB

SliTaz similar to Puppy LINUX loads entirely on the RAM and is very fast

SliTaz: (http://www.slitaz.org/en/)
SliTaz Installation wiki Page: (http://wiki.slitaz.org/doku.php?id=lang:en:langstart)

Avidemux Video Editor

Avidemux is a free video editor designed for simple cutting, filtering and encoding tasks. (URL: http://fixounet.free.fr/avidemux/) . Available for Windows, LINUX, MAC OS