very useful to create a simple login page on a website.
tipweb
Add a simple login block to any page.
This block uses the core login page to validate and redirect the user, and allows users to sign in using there concrete5 login credentials.
It hides from the user when he/she is logged in (exept when they can edit the page).
If you need more features from a login block, like supporting alternative login methodes, check: Login Block Pro