I use Slack, Telegram, Trello and email. Essentially I need channels that run smoothly on all my devices (Linux, MacOS, SailfishOS). I'm watching Slack closely

I use Slack, Telegram, Trello and email. Essentially I need channels that run smoothly on all my devices (Linux, MacOS, SailfishOS). I'm watching Slack closely since the sale to Salesforce, and will switch those groups to Telegram or Signal if I see cause for concern.