I3lock is a simple screen locker like slock. After starting it, you will see a white screen (you can configure the color/an image). You can return to your screen by entering your password.

i3lock forks so you can combine it with an alias to suspend to RAM.

You can specify either a background color or a PNG image which will be displayed while your screen is locked.

You can specify whether i3lock should bell upon a wrong password.

i3lock uses PAM and therefore is compatible with LDAP etc.