If you're wanting to build a portfolio for yourself, Wordpress is the most common option. If you're asking about a platforms for project managers (like Dribbbl

If you're wanting to build a portfolio for yourself, Wordpress is the most common option. If you're asking about a platforms for project managers (like Dribbble et al), I'd say that probably the reason why such a platform doesn't exist, is because project management isn't really a visual discipline in the way that design or even development may be. Most just tend to use their own website, giving them the flexibility to share their thought-process.