The best alternatives to InviteRobot are Quorum, SlackPass, and Community Inviter. If these 3 options don't work for you, we've listed a few more alternatives below.
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Postman Recorder by DevTools— Export Postman APIs from browser
Magik enables founders, marketers & community builders to create the community experience they never knew was possible. ⚡ Interact with members, build a community library, & stay up-to-date with your community, without ever leaving Slack. ✨
Sets is an add on for Slack that creates a community portal. It features: Simple profiles for members to find people with similar interests A wiki for your members to share resources A calendar of events that keeps your community up to date