12. Calibre. Best ebook collection and management software there is, nothing else can touch it paid or free.
14. OBS studio. The amount of power it has, and the number of people who built their careers off of it…absolutely insane that we have this now.
15. The draw.io is better than every paid diagramming/flowchart tool I’ve ever used.
17. The entire Python ecosystem. The breadth of the capabilities of community-supported libraries is simply amazing.
19. Zotero for in-text citations and making a reference list. Saved me in university!
20. Anything made by NirSoft or Sysinternals.