mainnav element is unnecessarily wide. Also too much of spacing between the elements in top-bar.

The margin to "About" in the mainnav looks a bit odd. Is it required?

The contents of the mainnav is oddly placed. I feel it can be organized from left to right in terms of usability to users. Like Downloads and Documentation first rest should follow in the respective orders.

The latest news can be placed somewhere in the first page itself for better visibility. Users has to scroll down now to see it.