Let's get this community popping with some useful information. Reddit's sysadmin subreddit seemed like a place of complainers, I look forward to having actual productive conversation in this community.
remote desktop manager by devolutions
powershell - duh
ansible
vscode
sharex or greenshot (I've been favoring sharex lately)
firefox with the container plugin (so I can keep the authentication contexts separate for all the o365 consoles I have to deal with)