We built an online To Do List and Project Management application called Manymoon on Grails. The framework helped us quickly develop a simple, working product that we could release to customers and start gathering feedback. Grails made it easy for us to quickly iterate and improve the application based on this feedback. We also liked the integration with Hibernate and Spring since it reduces the amount of time to develop and test code. We have received great feedback from customers on Manymoon...especially the performance! Manymoon is like Facebook for projects and you can use it today to manage your software development project.