Ask HN: What are your favorite utility desktop apps?

I'm a big fan of small, often indie, utility apps. Some apps I really dig:

- Monodraw: https://monodraw.helftone.com/

- Postgres.app: https://postgresapp.com/

- Lungo: https://sindresorhus.com/lungo

- Duet: https://www.duetdisplay.com/

- Magnet: http://magnet.crowdcafe.com/

What do you like?