3
Cryptpad might be something for you. It has a special focus on privacy:
CryptPad is a private-by-design alternative to popular office tools
and cloud services. All the content stored on CryptPad is encrypted
before being sent, which means nobody can access your data unless you
give them the keys (not even us).
It offers most of the usual office-type apps ...
2
We have setup Microsofts product line for our clients to replace Access. You could either utilize sharepoint, or a better option visually, the Common Data Service. It is not too expensive depending on how many users you have. I believe $35/m for one user to set up everything, and then at least $4 for each user that needs access to this data to make edits.
...
2
It's expensive, but a custom web application with a robust database backend may be what you need to meet your fairly specific needs, as well as the scale of your data. The Access database could be migrated to SQL Server using SQL Server Migration Assistant for Access and the business logic would have to be replicated in a web app (the obvious choice being a ....
1
You can try here, it says it does , but I have not tried it
Online-Convert to MP4
and the main site can convert alot of files audio, video, images, etc
Online-Convert
1
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
YES.
offers a web application to use within a browser
YES.
it should be easy for me to add new users to my messaging ...
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