What's the criteria for nomination? These didn't all come out in 2019. In fact I think some may have even come out in 2018. 
So if we're just awarding apps we think are great and have done an incredible amount for the community, then I nominate @stephack for Advanced Button Controller (ABC)
For honorable mention I'd also like to include @codahq (Ben). I'm terribly sorry that he has made the decision to leave the platform, but that doesn't mean I don't think he wrote one heck of a nice integration that I still use for my Ring Alarm System.
And although it isn't a widely used driver, I would have not been able to keep using my beloved Insteon devices if it wasn't for the fine work by @cwwilson08 (Chris Wilson). He spent many hours tolerating me, to build a fantastic driver (several of them actually) along with Scott Kuester's crucial contribution of the required Node.js server and listener. The kicker is, Chris doesn't even use Insteon!
And I must not forget @Cobra (Andrew Parker) with his wide range of apps and drivers that have been very useful to so many.
This is not an extensive list, but it's some of the primary community apps I use. The truth is, I wish everyone that contributed could be nominated. So much time spent, for quite often no compensation at all. I offer my personal thanks and applaud you all. 
