Cal.com
Open source scheduling infrastructure for everyone
Free for individuals, Team from $15/user/mo
Linear
Fast, beautiful issue tracking for modern teams
Free for small teams, from $8/user/mo
Notion
All-in-one workspace for notes, docs, and project management
Free for personal, Plus from $10/mo
Tally
Simple form builder that works like a doc
Free tier generous, Pro from $29/mo