Helms Deep Reborn, this is for L4D2 and it is quite easy but it is very interesting http://www.l4dmaps.com/details.php?file=7302

I highly advise everyone here to download this map http://www.l4dmaps.com/details.php?file=6857 .This is the most difficult map i have faced yet.

2 new addon maps have been found to work with the server, Detour ahead and city 17

The links are on the main page, they have been updated so you will need to get the newest versions