Last year, I covered five of the best open source project management tools, like ProjectLibre and OpenProject. The article struck a chord with readers and continues to prove valuable. So, this year I revisited the tools mentioned in last year's article, taking into account comments and suggestions from readers, and provided an update on where they are today. First, I share five new open source project management tools for 2015. All in all, this article will give you a good look at 11 of the top open source project management tools out there.