It's easy - just select the desired access level, copy this link and send it via email, instant message, etc.Link: Just a link to your wiki. Post this anywhere and people can ask you for the invite key.
Blogger. Get an account here and beginning journaling/blogging right away. http://www.blogger.com
OpenOffice.org. This is open source software which means it is free but comes with little or no tech support. This particular software provides users with a suite of software to help them with word processing, data managment, presentations, etc. http://www.openoffice.org/
Software for Starving Students. This is a free collection of free software that includes a full office suite, a browser, academic tools and more. http://softwarefor.org/