Feel free to edit this Wiki Post. It is not exhaustive, just what was randomly added between the appstore and github repos. Nextcloud 23 beta 1 was released on 10/12/2021. Continuing the discussion from Any apps not yet compatible with Version 22? Please reference those earlier threads for apps still unsupported in 21 and 22. I’ll do my best to embed that info below.
Version 23
App Name - link to the project Github issue. Please file an issue if you find an unsupported app in the appstore and no one has reported incompatibility. Check the box once it is supported.
Activities for shared file downloads, visible to all admins - Please add compatibility with Nextcloud V23 · Issue #25 · TimoKunze/files_trackdownloads · GitHub
AppOrder - Make app compatible with NC v23 · Issue #104 · juliushaertl/apporder · GitHub
Brute Force Settings - Make app compatible with NC v23 · Issue #335 · nextcloud/bruteforcesettings · GitHub
Carnet - Please add compatibility with Nextcloud V23 · Issue #173 · CarnetApp/CarnetNextcloud · GitHub
CAS Server - https://apps.nextcloud.com/apps/cas Needs issue
co2Clock - https://apps.nextcloud.com/apps/co2clock Needs issue
Community Document Server - compatibile with Nextcloud 23 · Issue #246 · nextcloud/documentserver_community · GitHub
Custom Properties - https://apps.nextcloud.com/apps/customproperties Needs issue
Data Request - https://apps.nextcloud.com/apps/data_request Needs issue
discourseSSO - https://apps.nextcloud.com/apps/discoursesso Needs issue
eID Login - https://apps.nextcloud.com/apps/eidlogin Needs issue
EML Viewer - Issues · newroco/emlviewer · GitHub Needs issue
End to End Encryption - Please make the app compatible with V23!
Flow Notifications - Make app compatible with NC v23 · Issue #42 · nextcloud/flow_notifications · GitHub
External user authentication - Nextcloud v23 support · Issue #186 · nextcloud/user_external · GitHub
Full text search - Support Nextcloud 23 · Issue #660 · nextcloud/fulltextsearch · GitHub
Full text search - elasticsearch - Support Nextcloud 23 · Issue #175 · nextcloud/fulltextsearch_elasticsearch · GitHub
Full text search - Files - Support Nextcloud 23 · Issue #144 · nextcloud/files_fulltextsearch · GitHub
Javascript XMPP Chat - NC 22 support ? · Issue #1065 · jsxc/jsxc · GitHub
Jitsi Integration Unofficial - https://pubcode.weimann.digital/projects/nextcloud-jitsi/issues/32
Majordomo - https://apps.nextcloud.com/apps/majordomo Needs issue
MediaDC - https://apps.nextcloud.com/apps/mediadc Needs issue
Mindmap - Support for NC 23 · Issue #163 · ACTom/files_mindmap · GitHub
ocDownloader - Please add compatibility with Nextcloud V23 · Issue #229 · e-alfred/ocdownloader · GitHub
NCDownloader - https://apps.nextcloud.com/apps/ncdownloader Needs issue
OpenHAB Viewer - https://apps.nextcloud.com/apps/openhab Needs issue
OpenID Connect Login - Add support for Nextcloud 23 · Issue #146 · pulsejet/nextcloud-oidc-login · GitHub
Passman - https://apps.nextcloud.com/apps/passman Needs issue
Rainloop - https://apps.nextcloud.com/apps/rainloop Needs issue
Recognize - https://apps.nextcloud.com/apps/recognize Needs issue
Restyaboard Integration - https://apps.nextcloud.com/apps/integration_restya Needs issue
Roundcube email - https://apps.nextcloud.com/apps/roundcubemail Needs issue
SecSignID - https://apps.nextcloud.com/apps/secsignid Needs issue
Sharepoint Backend - https://apps.nextcloud.com/apps/sharepoint Needs issue
SSO & SAML authentication - Add support for NC 23 · Issue #562 · nextcloud/user_saml · GitHub
Storj - Nextcloud 23 · Issue #13 · storj-thirdparty/nextcloud-app · GitHub
StromQuittung - no idea. needs issue
Talked Call Recording - Please add compatibility with Nextcloud V23 · Issue #20 · MetaProvide/talked-client · GitHub
Timetracker - https://apps.nextcloud.com/apps/timetracker
TV Show Renamer - Issues · j4ym0/nextcloud-tv-show-namer · GitHub Needs issue
User Backend Using Raw SQL - https://apps.nextcloud.com/apps/user_backend_sql_raw Needs issue
Write support for LDAP - https://apps.nextcloud.com/apps/ldap_write_support Needs issue