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I'll update this if I find more. For now, this seems to be a partial solution. It's a Gmail add on (except I don't use Gmail) that adds reminders. The options when setting reminders include cancelling it if someone replies, and to remind everyone in the thread. If you combine those two, it seems like — if you use Gmail's web client and have $23/month you're dying to get rid of — a decent way to add the feature. Source: over 1 year ago
Gmelius - Gmelius is the first collaboration platform designed for G Suite and your company's daily tools.
CoinMarketCap - Crypto-currency market capitalizations.
FollowUpThen - The simplest way to schedule an email reminder
BitsLeader - Bitsleader is an automated portfolio management tool that is designed for people who can't afford to look at the market 24/7. bitsleader allows them to sleep peacefully. whether it's a long-term investor or short-term.
Boomerang for Gmail - Boomerang for Gmail is a Firefox / Chrome plugin that lets you take control of when you send and receive email messages.
Cryptominded - Where you learn more about cryptocurrencies