Cacher is the code snippet organizer for pro developers. Curate a library of useful code snippets for you and your team.
WorkFrom is a crowd-sourced resource of coffee shops and other such places that are remote-work friendly.
One Tab (Free) tames tabs into a list which can be sorted and exported.
Organize your browser tabs into Toby so you can access key resources in one click instead of seven.
TripMode (6.99€) lets you control which apps can use the internet. Especially useful when you're working on a cellular/metered connection.
Teampaper Snap
Quitter (Free) will switch off apps for you after some period of inactivity. Consider using this to hide Slack after a while to reduce your urge to check new messages all the time.