I just completed another Power-Up for Trello, called Board Wiki.
I have really taken to using Trello to help organize many aspects of my life and one area that kept annoying me was that I always had to have a card setup on various lists for “meta” information or things like my weekly, quarterly and yearly plans (see Cal Newport). After thinking about it a bit, I realized since it makes sense to keep all this in one place, why not have a wiki to capture this, so this new Power-Up was created.
I have now created several Power-Ups a couple Office Web Add-ins and just published (still in review) an Edge Extension. To see everything I have published, check out my website.