Are Devs here still active?
Yes, they are working hard lately, you can check development in the first post:
Recent release history
29 Nov 2017 - 0.10.6.3: Enable POS by default
27 Nov 2017 - 0.10.6.2: Disconnect old peers, disable POS by default
13 Oct 2017 - 0.10.6.1: Hybrid POS/POW upgrade
3 May 2017 - 0.10.4.5: Checkpoints
22 Apr 2017 - 0.10.4.4: Improved syncing
21 Apr 2017 - 0.10.4.3: Disconnect old peers - Required upgrade for all Quark 0.9 wallets
9 Apr 2017 - 0.10.4.2: Start signalling for BIP66 (strict DER checking)
2 Apr 2017 - 0.10.4.1: Core 0.10 upgrade
15 Jun 2016 - 0.9.2.7: Update (Checkpoint, Win installlers, OSX build)
6 Oct 2015 - 0.9.2.6: Checkpoint
11 Sep 2015 - 0.9.2.5: Checkpoint. Update seed nodes.
31 May 2015 - 0.9.2.4: Checkpoint. Update seed nodes.
18 Jan 2015 - 0.9.2.3: MedianTime fix. Checkpoint.
17 Jan 2015 - 0.9.2.2: Checkpoint, OpenSSL fix.
25 Oct 2014 - 0.9.2.1 released.