Codeblocks has a Linux version compiler. There's a link to it under the related links.
A free Pascal compiler can be found in several locations. Download sites such as Brothersoft, Sourceforge, Bloodshed, Softpedia, and Tucows offer a free download of a Pascal compiler.
Almost all the linux OS's are free you can find them at their websites .
There are a variety of different Linux software downloads available for download. One can download basic Linux for free from sites such as Download Linux Free and Softonic.
One might find a Linux download for free at: Computer Hope, UBuntu, Softpedia, Kioskea, Linux Mint, Hungry Penguin,Software Archives, and PC Advisor.
Yes, you can download and use Picasa Linux at no charge. You will find the free download on a number of sites, and it is very easy to download and only takes a couple of minutes.
Linux generally comes installed with the free gcc compiler. MacOSX does too. But when you compile a program with gcc, it runs on the platform under which it was compiled. Therefore, programmers on OSX that need to deliver a Linux binary need to use gcc's cross-compiler mode to produce Linux binaries.
Not all version of Redhat Linux is free but you can download many desktop versions free.
Yes
The AVG Linux Server Edition 2012 is free of charge to download from the official AVG website. If you want to test it first, there is also a free trial download available.
Mandriva Linux 2007 is proprietary software, which means you need to buy it. You can, however, download and install a free trial-version, named Mandriva Linux Free 2007. Take a look at Mandriva's official website, where you can find a lot of useful information http://www.mandriva.com/en/download/free
gcc is a c compiler among many other things. It can also be used to compile code in other languages. gcc is a fairly advanced compiler and is used to compile Linux along with most other free(as in free speech) software.
Linux is a free to download operating system, so it is difficult to put a specific value on it.