I'll start with two new addtions for me:

• Capy Reader (code, F-Droid). While curating my Feedly subscriptions, I decided to try switching to some RSS feeds instead, which I had previously put off because I hadn't found a client I liked. Capy Reader is excellent both in performance and user interaction, and I find I much prefer reading my sources this way than through Feedly now.
• Readeck (code). Not technically an app, but the website works perfectly well through a mobile browser. A read-it-later service that snapshots web pages and displays them in a friendly, customizable reader mode. The only downside is that it doesn't cache the full content of the saved pages offline, so you can't use it without Internet access.