I really like open source projects for certain things, especially these productivity apps that may bring their little twists and design flair but ultimately end up holding a ton of user data. I'm pretty sure Vesper users would love to be able to easily move their data to a less beautiful (bye Ideal Sans!) but still functional alternative right now, without a massive conversion/migration process.

I ran into this with todo.txt on Android. The flagship app (https://github.com/ginatrapani/todo.txt-android) was basically abandoned, but it is open source and some time ago was forked into what became an active--and better--alternative (https://github.com/mpcjanssen/simpletask-android).