One of my favorite resources for finding recommended technology tools is the online PDF book, Exploring New Territories: FDLRS. This book combines information about Universal Access, Universal Design, accessible instructional materials, and assistive technologies. Within the UDL section it lists 8-15 examples and technology tools for each of the three principals of UDL. This section is followed by a section of technology tools and resources for each specific content area. There are many good tools listed here.
http://udltechtoolkit.wikispaces.com/ this wiki space has gathered a variety of links to online and downloadable tools to use within an UDL structure for learning and teaching. Tools include: Apps, audio books, text to speech software, graphic organizers, multimedia and digital story telling, study skills tools, writing tools, collaborative tools, research tools, math tools, tools that compensate for handwriting, and other helpful Apps or tools.
http://www.personalizelearning.com/p/toolkit.html this blog shows multiple visual representations of how UDL relates to common core, differentiated instruction, and personal learner profiles. In addition it has a visual representation of many different tools that a student could choose from to increase their learning in an UDL environment.
this tool kit is published by the U.S. office of Special Education Programs and includes UDL related papers, best practices, professional development modules, and video clips.