Many elf source codes are available at http://perk11.info/svn/SE/ .

These are free to download but it takes really long to download all files one by one. It's an svn server, so any svn (subversion) client can be used to download them.

I use Tortoise SVN, get it here http://tortoisesvn.net/downloads .

Install it. Reboot.

Then choose a directory, mine is E:\ELF\. Right click on it, and then click SVN Checkout.

You'll see something like this:

The URL of repository must be svn://svn.boba.su/SE.

It will ask you a username and a password, use guest, guest.

Then it can download all source codes and libs and stuff.

Later if you want to update the folder, you right click on it, and click SVN Update.