There are some steam sterilizers that stand in a category of their own. Sometimes, I run across a style or type with only a couple models that are similar. An example of this would be the stainless steel stove top models from Olizee and Orion Motor Tech. (They are basically hopped up pressure cookers!) Still others might be the small Statim cassette sterilizers.
As I research more autoclaves around the web, I’ll add my list here of the non-categorized machines here. I am working on a flowchart to break the entire market of table top sterilizers down into categories and features.