Yes, it's VATSIM (Flight Simulator ATC), but many of the links are to the actual websites of the various aviation authorities around the world (some websites are more user-friendly than others), so I consider those to be reliable sources. You'll have to get used to various different formats (no Jeppesen-style standardization across national borders), but short of subscribing to JeppView or LIDO, it's probably the best you'll do.
-Mir
7 billion, one nation, imagination...it's a beautiful day