Simple Mobile apps have been very popular among FOSS enthusiasts. I've personally been using the Gallery, Contacts and the Phone app since a few years now. It's a shame that it has come to this, will be on the lookout for their forks.
Oh no, those apps have replaced many of the OEM' supplied ones on all my devices. I was fed up with constantly changing UIs and all the different feature sets on every device. I thought I had finally found something useful to consolidate on for the long term!
At least the current versions are pretty bug free and will stay.