Followup.cc might be a bit more popular than Haystack. We know about 1 link to it since March 2021 and only 1 link to Haystack. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
If you are looking to make a virtual business card I would recommend using a website like https://thehaystackapp.com/ or other similar ones found online. In terms of what you want to include just your name may be a short listing of your experience and a picture of you. In terms of your portfolio again you would normally use a website creator and make your website. Some options there are Squarespace, Wix. WordPress... Source: about 3 years ago
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
HiHello - Exchange contacts, seamlessly.
FollowUpThen - The simplest way to schedule an email reminder
CamCard - CamCard reads business cards and save instantly to phone Contacts.
Gmelius - Gmelius is the first collaboration platform designed for G Suite and your company's daily tools.
Sansan - Sansan provides a internal contact sharing service for companies.
Boomerang for Gmail - Boomerang for Gmail is a Firefox / Chrome plugin that lets you take control of when you send and receive email messages.