Unlike some of the other Walls out there, PrimaryWall was concieved by a teacher and is built for schools so they deliberately kept things simple, fast and user friendly. The font size of the notes is quite large when typed to make it easier for younger users. Some lesson plans and ideas for teachers are provided on the site.
Scrumblr is a very simple brainstorming tool. The post-it notes you can add to the page are purely text - you can't add links, images or videos like other tools such as Wallwisher or Stixy. It's basic, but this can be a useful feature as there are less distractions or things to confuse learners. Simply click the + icon to add more notes and double click on the notes to add text. You can also add text to the backgound to create different zones.
Stixy allows you to create tasks, appointments, files, photos, notes, and bookmarks on their Stixyboards, organized in whatever way makes sense to them. Then they can share Stixyboards with friends, family, and colleagues. You could set up a Stixy board for class projects, for brainstorming or for the collection notes and resources. You can control who has access, and whether visitors can read or amend the board.