apt-fast is a shell script to accelerate apt-get downloads using Axel, a command line download accelerator. Based on apt-fast, some other scripts have been created and I though they are worth mentioning:
Remember apt-fast? Allow me to remind you: apt-fast is a simple bash script that speeds up apt-get download speed (so you would run "sudo apt-fast install firefox" to install Firefox for example) by using Axel, a command line application which accelerates HTTP/FTP downloads by using multiple sources for one file.
Apt-linker is a Chrome extensions which turns "apt-get install" text from websites into apt:// links, meaning you'll be able to click any "apt-get install" line to install applications instead of having to copy/paste t
Axel is a command line application which accelerates HTTP/FTP downloads by using multiple sources for one file. For example, some FTP sites limit the speed of each connection, therefore opening more than one connection at a time multiplies the allowable bandwidth.
Here is all you need to know about package management on Linux. By package management I mean how you install, update, or remove a package.
The most concise expression is: 
Apt-get it or for-get it.
Put another way:
If you cannot install a package using apt-get then you should forget about it. If the author doesn’t provide it so it can be installed with apt-get, then it’s not yet ready for serious consideration, so you shouldn’t waste your time on it if you have to use another package manager.
Downloading software from repositories can be a long and daunting task especially when you are downloading from a repository server which is far from your location.
If you’re a GetDeb.net user, you can use this tip to sync your GetDeb packages with the update manager and Synaptic.