Internal apps or tools are underrated or even unknown by most organizations.

Lots of communications, file sharing, collaborations going on in between departments and email or certain ERP/All-in-One systems are placed and forcing users to adapt is not very straight forward.

In the recent years, the movement of No Code and Low Code progressed fair amount and gained good attraction.
Apps made on top of your existing google sheet or Excel files or other work flows makes life easier for users by adding automations, integrations and add-ons.

When planned & executed correctly, those can help in your internal operations efficiencies and reduce human errors all without interactions from tech/developer teams or very few input comparing to if developed in house apps.

Some of low-code and no-code providers are BubbleAirtableAppSheetOutSystemsRetool and lots more.