I'm looking for some time for a good user self management.
"Good" means: User can add their own accounts, gets approved (or not),
can recover the password, ...
Of course, there are plenty implementations of that available in the market -
most wikis have that, as well as lots of other applications.
But all of them are embedded-only, i.e. one has to use that web application
and gets "vendor-locked". Isn't there anything open source and standalone
available, following the basic unix principles of "do one thing and do it well"?