Notable collaboration & project management software vendors include:
Ten of the players listed above have public or private market valuations of $1B+ (more on the valuations below).
Monday.com, Asana, and Smartsheet are all publicly traded. Trello (acquired by Atlassian for $425M), Wrike (acquired by Citrix for $2.3B), and Planview (acquired by TA Associates and TPG Capital) are no longer standalone companies.