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.
Fucking hell now I need alternatives to my dialer, my gallery (this will be the hardest one to replace because the editing for simple gallery was amazing), contacts, and clock. Does anyone have any suggestions?
For Contacts and Clock, use YOU apps. I don't think anything can replace the Gallery, I'll continue using the current version for as long as there's a new community-maintained fork. It's quite stable really, doesn't really need changing this very moment.
Contact YOU app has SMS inbuilt. The SMS support is in very early stage so buggy but the dev is going on at an amazing pace. Just give it a few more months.
For dialer, I'd keep using the simple app for now. There's Koler with material you theme but it hasn't seen dev in 5 months and doesn't have all the feature like regex-based call blocking.
Downside is that it does not support MMS and they don't plan to add it. SMS will always cut off at 160 characters, making you send multiple SMS to send it all, instead of sending a big MMS. Also means you can't send pictures.
To be fair something like the dialer or the gallery or the notes, you can just sticky the current version you have. It's unlikely to ever see major / important changes, I mean all the dialer has to do is to dial numbers, right=
The hardest one for me to replace with be the file manager. I had already tried Amaze and Material and didn't like either before settling on Simple. sigh