CryptoGround
What If Bitcoin?
Cryptominded
Robinhood
Crypto Buyer's Guide
Margin Calculator
Bitcoin or IPO
Signals Network
Followup.cc
Gmelius
FollowUpThen
Boomerang for Gmail
Onesheet CRM
Right Inbox
Mailbutler
Freshsales CRM
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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
What If Bitcoin? - Check how much you could have made by investing in bitcoin.
Gmelius - Gmelius is the first collaboration platform designed for G Suite and your company's daily tools.
Cryptominded - Where you learn more about cryptocurrencies
FollowUpThen - The simplest way to schedule an email reminder
Robinhood - Free stock trading service.
Boomerang for Gmail - Boomerang for Gmail is a Firefox / Chrome plugin that lets you take control of when you send and receive email messages.