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?