The best alternatives to IC Project are Basecamp, Quip, and Oppwiser. If these 3 options don't work for you, we've listed a few more alternatives below.
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Sigma - See the Next Generation of Analytics— AI, Data Apps, Python - Attend the launch!
Quip helps teams get more done by seamlessly blending documents, data, & conversations in a unified platform available online, as an app, or inside Salesforce.
Task Rocket is a WordPress based theme for the best and easiest way to manage your projects. Simply activate the theme (and any extensions) and you're all set.