RPI4/400 is perfectly capable as a little home server. All it needs is a good SD card.

Owntracks,photoprism,monocker,brave go m-sync,libre photos,wallabag,radicals e,Baikal,Firefox sync,Joplin web,webdav server,jellyfin,vaultwarden,wireguard

Vaultwarden behind mutual tls and reverse proxy and https://github.com/oguzhane/bitwarden-mobile until https://github.com/bitwarden/mobile/pull/2629 is merged

But honestly all services you mentioned are worthy.

Anything that fits your needs imao

Notes:Joplin (over webdav)

File manager:material files

Cloud:webdav provider (webdav mount in material files)

Contacts/calendar:davx5-etar

Sms/call log backup:smsIO

Cast:Bubbleupnp (non Foss)

Browser:mull/brave

Password manager:Bitwarden

Office:proprietary

Themes:Substratum

Maps:here (non Foss)

Gsm location provider:MozillaNLP/MicroG

Speetch to text:localstt

Text to speech:Flite/espeak/rhvoice

Keyboard:Anysoftkeyboard

Network scanner:Ning

Find my device:Nulides Findmydevice

Call recorder:BCR(magisk module)

Weather:Geometric Weather

Parental control:Time limit

RSS:read you

App store:obtainium

Bookmarks:wallabag

2fa:aegis

Location history:traccar/owntracks

Email:tutanota

Image2text:OCR

Translate:deepl

Photos:uhuruphotos/photoprism android gallery/Aves/image toolbox

Appops:app manager

Addblocker:addaway

Files encryption:droidfs

Downloader:download navi

Filesync:folder sync(non Foss/paid but best)

Logs:logcat reader

Launcher:nova(non Foss/paid but best)

Doc scan:open scan

Kernel manager:smart pack

VPN/tunnels:wireguard

https://github.com/photoprism/photoprism

And

https://github.com/LibrePhotos/librephotos

With

https://github.com/...

And

https://github.com/...

Android clients

Tailscale is not completely foss.

https://tailscale.com/opensource

Nextcloud is an overkill. Its just too much. I'd say better split down the needed services. Baikal/radicale etc for contacts/calendar. Photoprism/librephotos etc for photos. A webdav server for storage. And so on.

Icard is actuality the only alternative that can register as a contactless nfc payment that not relying on google/Apple wallet and its perfectly safe. It's an actual bank in Bulgaria and is eu regulated and PCI certified

https://icard.com/en/security

Not Foss. Kinda of a privacy nightmare as you need to verify your identity and location with actual documents but as already said its not google and is a solid option if you are degoogled.

Headscale does not support funnels unfortunately

This probably will never hapen Being a flutter app needs flutter plugins to call the aprpriate android api's This is problematic when it comes to silent instalations

https://github.com/ImranR98/Obtainium/issues/25

Davx⁵ has Mac OS caldav carddav server integration so you can sync with it.

https://www.davx5.com/...

On android you can use simple calendar or etar to view calendars and "tasks" or jtxboard for tasks/journals

Flash microg if your rom has signature spoofing

You'll still have gms and google apps installed also the proprietary apps installed Most are system apps but some can be uninstalled

Have in mind in stock OS's you'll need an account to recover from a factory reset

Together with the other suggestions jtx board is also a new addition Developed from the davx5 team , tasks,calendars,journals and NOTES.

The good: Easy sync of notes with any caldav provider . No extra servers and apps for tasks,cakendars,journals. Mtls support ( davx5 supports it ) for extra security if you selfhost

The bad: No desktop client

Owntracks , overland or traccar apps to track device coords when it moves

Then Owntracks offer a very basic webui to show your track or pins within a specific time period on a map

Dawarich has some extra features and can handle google takeout and both Owntracks and overland json's

https://github.com/Freika/dawarich

Traccar has many features too

All apps require a server

I am also starting a web app that fit my needs

It offers search , route grouping , and a date picker .

I'm struggling to implement new features like poi visited locations , google takeout import , support other apps except owntracka, beatify it a bit etc but I'm no real Dev .

Either way you might want to have a look

https://github.com/ippocratis/location-history

Same as above its a speech to text engine not a recorder but honestly thats all you need

https://github.com/ewheelerinc/LocalSTT

I use https://github.com/...

There are many dockerised fileservers

"But, thinking about it now, I doubt it will actually affect the feature"

It will not

We don't need to import a custom CA authority here just to insatll a client cert

Thats a great idea but it will require some short of an fdroid account

I mean your donation history have to be stored somewhere in case the apps data on phone gets wiped e.g. app uninstalled

You can view your donations in github though

Brave sync server is open source and self host able.

Everything a browser syncs is syncable passwords, history, bookmarks, cards etc

The "issue" is there is not a user interface element to easily add the self hosted instance url

There are workarounds though

You can read my quick how to here

https://ippocratis.github.io/brave/

Google bans new acounts that never used in official playstore before

Use a spare gmail acount that you have also used with playstore

Anonymus logins also get rate limits or get banned

As for alternative

App lounge from /e/ OS uses auroraOSS Gstore api to download from playstore so it's basically like using aurora

Other than that the are Python scripts you could use on termux but those also need a proper gmail account

Same apply to linux/windows programs available

I always used my "normal" google account in Aurora also been using this account with microg since ages Never had an issue I don't care if the account gets banned though.

Maybe appkmirror is the only other "sane" option.