TextProject aims to bring beginning and struggling readers to high levels of literacy through a variety of strategies and tools, particularly the texts used for reading instruction.
The leader of this project, Elfrieda Heibert, is on the IRA Common Core ELA standards committee as well. One of the most interesting things I saw on the text complexity module is how we can modify the complexity levels of texts (higher and lower) by making a few changes to word choice, conventions, sentence length, etc. There are good examples included. This may be something valuable for students with IEPs and those learning English.