What is the meaning of this?

In IT slang this is told when there is no or poor documentation available for a given program, thus the only way to understand it is to read through the source of it. This can only be done if one has access to the source code itself, which is not case with most of the commercial softwares, but it is with open source and free softwares^[1].

Why does this matters so much to you?

I learnt pretty much everything about software and computers using free software and did contributed to this community.

Who are you and why do you have this domain?

My name is Alex Beregszászi. You can email me on this domain, the address is my first name at this domain.

[1] "free as in free speech, not as in free beer"