JIRA, monday.com, Redmine, Microsoft Project, GanttProject, ClickUp, Focalboard, Taiga.io, Kanboard, Wrike, AFFiNE, Quire, Daylite, Open Atrium, Productive.io, FogBugz, Intervals, Doolphy, Zoho Sprints, OpenGOO, voo2do, Unified Inbox, Spider Project, Bearbook Projects, TimeLog Project, Ofuz, Stepsie, ADIOS Business Suite, Comindwork, Splendid Bacon, Tadagraph, YouProjects, VEOProject, ZilicusPM, Apollo Project and Contact Management, JREAM Projects, Collabor8Online, ClientSpot, BetterMeans are some alternatives to ActiveCollab.