able to exist and perform in harmonious or agreeable combination
"a compatible married couple"
"her deeds were compatible with her ideology" capable of being used with or connected to other devices or components without modification capable of forming a homogeneous mixture that neither separates nor is altered by chemical interaction
SimilarMinds.com
Tim Flynn's personal site offering several personality tests, a database of blogs/journals searchable by Enneagram type, articles, and a forum. http://similarminds.com