Vortex is a level based wargame focusing on basic (and sometimes not so basic) exploitation techniques on a linux/x86 environment. It covers basic stack smashes, non executable stacks, heap exploitation (both old glibc and freebsd), reverse engineering and crypto related areas.
More information on vortex can be found here and here.
As far as I'm concerned, vortex is completed, bar needed ongoing maintenance.
Blacksun focuses on advanced exploitation techniques in difficult circumstances. It focuses on linux/x86, with the grsecurity and PaX hardening projects. Blacksun focuses on exploitable conditions under various circumstances, such as address space layout randomisation, non executable memory, acl systems, and so fourth.
Blacksun is currently on hold while I focus on other things, but I hope to pick up again with this and continue it further.
Blacksun can be found here.