scrumblr is a web-based simulation of a physical agile sprint board that supports real-time collaboration.

ScrumDesk provides intuitive view on stories (tasks) using index card view and enable project management collaboration. ScrumDesk is not only for project managers. ScrumDesk connects project teams, team members with customers and management. Everyone can easily identify status of the project using reports that displays typically used SCRUM metrics such as a burndown chart, release metrics, parking lot and so on. ScrumDesk provide at any time easy access to collaboration tools including messaging, internet calls, emails, web pages and bug tracking systems.

ScrumDo is an Agile/Scrum story management web application.

ScrumEdge is a collaborative scrum tool that allows agile development teams, ScrumMasters, and stakeholders to manage the Scrum lifecycle at the product and sprint levels, allowing them to deliver high quality products in short time-frames. With ScrumEdge you'll no longer need to deal with shared excel-sheets or walls covered in post-its! The icing on the cake is the ease with which ScrumMasters and Team Members can access their data and view a project's progress from any location; office, home or even while traveling!

Scrumforce is a Force.com app on the AppExchange that provides the ability to manage SCRUM agile projects.

Scrumie is very simple implementation of scrum board, it can help you with task management in sprint when you don't have access to physical board or you work online.

Scrumine is a plugin for Redmine that provides project management using Scrum.

ScrumNinja is enabling businesses to deliver value to their customers by helping them focus on what is most important and making that progress visible. In the age of complicated, bloated enterprise tools, we yearn for the simplicity of low-tech tools for Scrum like index cards and cork boards. ScrumNinja gives the best of these low-tech tools with the ease-of-use of a web 2.0 application, striking a balance between simplicity and effectiveness.

An online Scrum tool that is intuitive, simple, and realtime.

Scruwp is one more tool for managing Scrum web. But what differs from many other tools that we have out there is that you run locally on your own server, maintaining the confidentiality of their data and allowing to use it completely offline.