OpenProject vs. Wrike

The online project management software, Wrike, describes itself as a "cloud-based, cross-team software for collaboration and project management". It claims to be suitable for businesses of any size and industry. For small teams (up to 5 users), the use is free, beyond that, it is available in a Professional, Business, Marketers, Marketers Performance, Professional Services, Professional Services Performance, and Enterprise versions. Wrike itself speaks of "20,000+ companies" and "over 2 million users" who currently rely on the software. Its worldwide headquarters is in San Jose, CA.