There are versions of Android which don't include Google software. LineageOS with microg would work. This is a full Android OS, with a compatibility layer that reproduces the Google Play Services API which many apps depend on.
There is also a new OS called /e/ which might do the same thing and has an app store.
To record a WhatsApp video call on Android, it is necessary to install an app. Android does not natively offer the option, however, some manufacturers natively offer the ability to record the screen (with sound) of your Android smartphone. This is the case with Huawei smartphones in particular. If you do not have such an option, you must download an external ...
I was needed the same functions so I created a simple SMS to URL Android forwarding App.
Since Google refused to publish it in the Play Store, because it needed read SMS permission, you can install it directly from the apk here.
If you miss some functions in this app - feel free to open a ticket on Github.
Telegram has a Bot API that does exactly what you seek.
They have samples for all the possible programming languages, so it's totally not a problem.
Going through your requirements:
offers an api to integrate in my development environment
offers a web application to use within a browser
it should be easy for me to add new users to my messaging ...
A little late to the party, but still a valid answer. :-)
I've found that "Smart Audiobook Player" is almost perfect for my needs, all for just $2 !!!
There's not much is doesn't do with regards what you might want when listening to an audiobook... it will even sync your progress across devices, while keeping that information locally for safe-...
I think you are looking for blocking youtube as any apps you can control using app lock and putting a password on that. Tough password so that you have to look to type not by remembering. If that is the case then use v browser for android as it only allow to search and read information.