I used to use Monosnap for screenshots but ever since I found CleanShot it has replaced Monosnap for me completely. It is a super polished app, has a cloud component for easy sharing and even allows you to take super long screenshots by scrolling!
Obsidian > Roam
I have my Obsidian notes indexed in my DevonThink so my entire knowledge management system feels super integrated. The team is super active on Discord and I can already feel this will be a winner!
DevonThink is my Evernote replacement of choice. It works super well with Omnifocus and Airmail, my email and task managers to allow me to keep every document I ever need in sync through iCloud and/or a WebDav server. Super flexible and polished app.
Omnifocus basically runs my life, I have used every todo app under the sun and Omnifocus is the only one that has been able to rise to any complex task/period of my life I can throw at it. 100% worth the time investment to learn it.