<p>We had a starting point on the developer wiki, but sadly it's rather out of date due to a number of changes to the plugins since that document was written. The concepts are generally the same, but the implementation has changed.</p>
<p>You might want to read through that document, and then go and look at either the Songs or the Bibles plugins. They are the two plugins that have received the most attention.</p>
<p>Also, if you want to do any development, I highly recommend you hang out in the OpenLP IRC channel (see the Live IRC Chat page), as the developers are in there, and a lot of correspondence, communication, arrangements, and other important information happens in the IRC channel.</p>