F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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It feels completely different, yet very similar. I like it. Feels like the most modern app on my phone now.
Edit: I don't like the floating action button search but that's just my opinion. Maybe I just have to get used to it.
I like Droidify, also looks very modern.
Same. The UI seems very sensible n decently compact for me.
I think they're trying to add support for index V2. It'll be awesome when that gets implemented(as I use a 3G network).