Keyboarding is one of the most common recommendations for students that struggle with writing, although it's not always taught in our schools. Thankfully, there's plenty of free, online tutorials that offer instruction and practice. Most will evaluate skills initially, then offer practice exercises and games to increase proficiency. Progress reports can be motivating, especially if there are end goals for increased speed and error reduction. This site, All the Touch-Typing Tutors, lists free and share-ware downloads. Each site listed has a good description of its features and a screen shot.
Thank you to Kindy Segovia for the post about this site on her Blog. Kindy Segovia's Blog is a great resource for all things AT and UDL. She is the AT Consultant at Kent ISD.