I previously wrote about an open source project that provided an alternative for the iPad exclusive UIPopoverController object, WEPopover. I was recently introduced to another popover-like open source project, FPPopover, by Pietro Saccomani of 50pixels.
The screenshots below show a few variations of the FPPopover control on an iPhone:
With the 50pixels popover, you can easily customize the color and size of popovers, as well as the placement of the directional arrows (although the defaults work quite well).
You can download FPPopover from github.
Open Source Recommendations ?
If you have a recommendation for an open source project, send me an email.