Sakai is LTI™ compatible, and has been since version 2.5. Here are some resources on using LTI with Sakai:

• Sakai LTI Home
• Make an account – Include full name and E-Mail
• Make a site, Add Basic LTI, Configure the BLTI Tool
• http://wiscrowd.appspot.com/wiscrowd
• Key = 12345 / secret