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.
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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.