The voting period has ended. Thanks for everyone taking part, and congratulations to Dario, Penelope, and Unbrutal Russian! (The bounties will be distributed shortly.)
What were the best answers of the year 2019? Nominate your favorites and vote on other people's suggestions! To nominate an answer, simply post it an answer to this question with a link and brief description of the answer. You can nominate as many answers as you want.
The nominated answers must have been originally posted in 2019. To get you started, here is a search for all answers from this period with positive score. The answer doesn't have to be accepted, and it doesn't matter if it has already received a bounty.
Everyone is invited to nominate and vote! After about a month (April 10, but I make no promise about the exact time), the three nominations with the highest scores on this meta post will be declared the winners. The three winning answers will be rewarded with bounties of 100 reputation points each, from the personal reputation stashes of the moderators. (If the scores are tied, we will reward at least three answers and give out at least 300 reputation in some way.)
Of course, anyone with 75 or more reputation is free to reward any answer they like at any time. Consider this contest also as an opportunity to highlight some hidden gems that received few votes but are excellent in quality.
This question is focused on 2019 only. We'll do a separate one for 2020 a bit later.