Notion
notion.so
Docs, wikis and databases in one canvas
from $10/moFree plan
Basecamp
Flat-fee project management, on purpose
Free trialProject ManagementSince 2004
from $15/moVisit basecamp.com
What Basecamp is
Message boards, to-dos, docs and chat with a deliberately small feature set and a flat unlimited-users price on the Pro plan.
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Basecamp alternatives
Other tools in project management that cover similar ground. Full comparison.