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whatsapp-to-signal-chat-transfer
Utility to transfer chat history from whatsapp over to signal as good as possible
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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.
Could I bribe you into making a Signal backend for matterbridge, a program that bridges chats across platforms? (E.g. you post something on IRC and matterbridge automatically replicates it to Discord and Telegram and Mattermost, same for the other directions.)
Here is a list of marketable README examples from that guide: https://github.com/matiassingers/awesome-readme
Here is a useful guide I have found: https://github.com/zenika-open-source/open-source-promotion-cheat-sheet