I'm a Java EE developer and I was wondering if anybody has had experience with the OWASP Project and could weigh-in as to how it measures up as a security standards organization. They have a huge website with multitudes of documents, sub-projects, frameworks/APIs, etc., and I just want to be sure that they are well-regarded before I start heading down the path of learning about it from the ground-up. I would hate to spend the next couple of weeks investing time & energy in this group only to find out that they aren't credible for whatever reason.
Are there other project bodies that are also open source that I should consider, as well?