Probably every comment but install linux

Also using Niagara launcher Wallpaper is my own picture, icon pack is articons

Not worth hurting inde Devs tbh, If you want deals outside of steam sales then try isthereanydeal

The closest is nextcloud collectives, tables, tasks and deck

I personally like Nextcloud notes for quick notes and nextcloud collectives for detailed stuff e.g revision. With nextcloud tables and deck it makes a great notion replacement