Nextcloud

This is a FOSS Cloud, its like M$-OneDrive / Google Drive, but local.
It allows you to syncronize your Files across multiple Computers, and to Share them online with a Download-Link.
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Vaultwarden

This is a FOSS Password Manager. It can store your Passwords, SSH Keys and even some Files.
It can also check if you are reusing Passwords Multiple Times, and if your Passwords have been found in a Data Leak.
And ofcourse it can generate insanely long Passwords that look like Lettersalad.
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Jellyfin

This is a FOSS Media Server, think of it like Netflix or simmilar.
It hosts, reencodes and serves Movies and Series, which the Server Operators legally added, to Users.
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Vikunja

This is a FOSS ToDo App.
You can write things into it that you need to do, and link them, so that one thing can block another.
It also allows to Collaborate on a Project / ToDo-List.
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