MindSumo is described as 'connects companies with a community of 300,000 college students to work on challenges that impact the world. Companies host challenges for creative ideas and insights, as well as the ability to hire stand-out performers'. There are four alternatives to MindSumo for iPhone, Online / Web-based, SaaS, Android and iPad. The best alternative is Crowdicity. It's not free, so if you're looking for a free alternative, you could try IdeaScale or Innovation Cloud.
Idea management software for smart organizations. Crowdicity is the easier way to harness the ideas and insights of your employees, partners, customers or anyone whose experience can help your organization do things better.