Dreamworld (Offsite link) - a competitior to Second Life and Activeworlds.

MOOs and MUDs (offsite link)
MOOs and MUDs are text-based virtual reality sites that allow people to connect at the same time and interact. They are educational spaces. They differ from chat-rooms in that they allow for manipulation and interaction with cyberobjects and live communication.

WebKins (offsite link) is a virtual environment for younger children. Using puppet characters children can connect with friends and interact in a cartoon like environment while playing games, earning virtual cash, and building rooms for their puppets. Account requires purchase of a puppet in stores nationwide. Accounts are bought through the purpose of beany puppet whose character becomes ones when you sign it up on the website. Accounts expire. This environment is safer than WhyVille since children can only connect to one another if they know their friends account names.

Virtual Visits - Many websites also offer virtual visits to places of interest, using photography and Flash technology. Places of interest are such as foreign countries and cultures, museums, etc. Some sites offer study materials and work sheets to enchance the learning experience without students having to leave the classroom. To explore virtual visits further use this link as a starting point.