The JGUM vision and purpose

JGUM's vision: To create a truly simple, reusable and feature rich user management system which is highly configurable and accessible via all major protocols.

Nearly every application has a user management system. Yet no such system is widely available for this common need. JGUM aims to change that.

I think Mike Cannon-Brookes lays out the case for such a tool/framework quite accurately here in
Mike's interview with The Server Side discussing (among many other things) OSUser.

OSUser is likely a very good solution given that its being leveraged in Jira and Confluence however an 'official' download is not currently available and even if it were JGUM has some different goals. Additionally JGUM has a web based admin GUI which is highly functional (if not yet aesthetically pleasing).