I’ve been using Nextcloud since 2017 on my own server but I also maintain other Nextcloud installations.
Since 2020 I am also a developer for the Nextcloud integration of Keeweb (source at Github) and also take care of the provision of new releases.
Following are some of the apps I use in Nextcloud (as of December 2022):
- Bookmarks (including synchronization in Vivaldi with Floccus)
- Custom CSS to customize the design (also see Nextcloud 25 – “everything so round”)
- DICOM Viewer
- Full text search
- Nextcloud Office (in the past I also used OnlyOffice)