BiblioSpot was a web app that let you take sermon notes. It was the first application I built when I was learning to code.
When writing your note, it would display the bible verse at the side for reference. You could also group notes by sermon series.
The app never had a great amount of usage - it was really just me and one other person. It featured an app on the Amazon App Store (since I had a Fire tablet at the time), in fact, the app's still live on the App Store.