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matterbridge
bridge between mattermost, IRC, gitter, xmpp, slack, discord, telegram, rocketchat, twitch, ssh-chat, zulip, whatsapp, keybase, matrix, microsoft teams, nextcloud, mumble, vk and more with REST API (mattermost not required!)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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Ferdium
Ferdium is a desktop app that helps you organize how you use your favourite apps by combining them into one application.
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
In the past, I’ve used Matrix with bridges which you can all self host. The bridges essentially pipe messages through to Matrix from another chat platform so for example, you could see a WhatsApp group chat within Matrix as if everyone was using Matrix. There’s bridges available for most of the popular chat apps including all the ones you’ve listed. From my experience it works pretty well, but you end up having the apps on your phone anyway in case something breaks.
https://github.com/42wim/matterbridge perhaps?
There is also https://meetfranz.com/. But its neither selfhosted nor free. (well unless you only need 3 different services)
This one is excellent https://github.com/caronc/apprise