Templates for teachers provides lots of free teacher resources that can be printed. Many of the templates are modifiable and/or printable. There are 100's grids, graphic organizers, hall passes, flash cards, thank you notes, ABC flash cards, handwriting practice forms, DOLCH flash cards for 1st, 2nd, and 3rd grade, plus muchmore.
Encyclopedia of the Earth an electronic reference about the Earth, its natural environmetns, and their interaction with society. It is a free, fully searchable collection of articles written by scholars, professionals, educators, and experts who collaborate and review each other's work. The articles are written in non-technical language and are useful to students, educators, scholars, and professionals, as well as to the general public.
This is a cool site to checkout and bookmark the tools that you may be able to use at some point. Timelines are great in that they provide a way for students to organize their thinking about a particular topic. Check out some of the timeline tools outlined in this link.