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Mattermost
Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..
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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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Wekan
The Open Source kanban (built with Meteor). Keep variable/table/field names camelCase. For translations, only add Pull Request changes to wekan/i18n/en.i18n.json , other translations are done at https://app.transifex.com/wekan/wekan only.
Check out TaskCafe, https://github.com/JordanKnott/taskcafe Its not the most active project out there, but if you like to tinker this could be what you looking for.
I too have been frustrated by the lack of kanban projects with mobile. I personally prefer a native mobile app vs a webpage. What I ended up settling on was Mattermost . I think it should tick most of your boxes.
i suggest you https://wekan.github.io/