Below are a few more suggested corrections to the website. For now I've limited myself to grammar changes only. But it might be worth considering creating a user-oriented FAQ that limits jargon and covers general questions, and a creating a separate developer or "get involved" FAQ that covers more technical topics like submitting patches, etc.
A simple example of unnecessary jargon is the question "Is there a port of Jitsi for 'Android'?" It could be written as "Can I run Jitsi on Android phones?" A more extreme example of jargon is the explanation of "Why does my call stay in the 'Initiating Call' status and I can never connect?" https://jitsi.org/index.php/Documentation/FAQ#fragmentation
page reads: "we picked the name mainly because it was short and sounded well."
should read: "we picked the name mainly because it was short and sounded *good*."
page reads: "First of all you�ll need to email directly the development list"
it sounds more natural to me to move the word "directly" after "development list": "First of all you�ll need to email the development list directly and describe in detail what new feature you want to see in Jitsi"
Preferably you could simplify the whole sentence: "Send an email to the development list with a detailed description of the requested feature."
page reads: "you would like be asked to open a ticket"
page should read: "you would *likely* be asked to open a ticket"
page reads: "This can if you are using UDP"
page should read: "This can *happen* if you are using UDP"
page reads: "This is what happens when client support multiple features ;). "
page should read: "This is what happens when *a* client *supports* multiple features ;). "
page reads: "retrieve a part or its entire configuration"
page should read: "retrieve *part or all its* configuration"
page reads: "codecs we use, the features that users can manually configure and even protocol accounts."
sentence needs to standardize on second or third person (or avoid them both): "codecs, Jitsi configurations and even protocol accounts."
page reads: 'Is there a port of Jitsi for �Android� ?'
page should read: 'Is there a port of Jitsi for �Android�?' (delete the space before the question mark, per English grammar)