Followup.cc
Gmelius
FollowUpThen
Boomerang for Gmail
Onesheet CRM
Right Inbox
Mailbutler
Freshsales CRM
Rydoo
Expensify
Abacus
Zoho Expense
Fyle
Spendesk
Nexonia
TravelPerk
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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.
Expensify - Import expenses directly from a credit card to create free expense reports quickly. Approve reports online and reimburse directly to a checking account with one click.
FollowUpThen - The simplest way to schedule an email reminder
Abacus - Expenses without the 'expense report'
Boomerang for Gmail - Boomerang for Gmail is a Firefox / Chrome plugin that lets you take control of when you send and receive email messages.
Zoho Expense - Automate your expense reporting process and streamline the approval flow.
