Wikispaces and PBwiki

Both Wikispaces and PBwikis are free for basic services. There are different plans available over and above. The charges for additional plans vary according to the features that have beeen selected. Wikispaces has ads on free wikis. PBwikis have no ads for educational/instructional wikis. PBwikis offer five presentation styles. Wikispaces offers some fixed themes that can be customized. In order to customize themes, some knowledge of HTML and CSS is required. There really is very little difference between PBwikis and Wikispaces as far as the editing features are concerned. Both the services offer text formatting, bullets, links and tables.