Q:

What are words which stand at the very end of a sentence (like "yo" and "tomo") called?

As far as I know, "yo" at the end of a sentence indicates that quite new information is contained in the sentence, "tomo" ascertains that the content expressed in the sentence is definitely true. Both are placed even behind the predicative of the sentence: sentence-yo, sentence-tomo.
Do you know other words that are used like them?

A:

These are called "sentence-final particles", or [終助詞]{しゅう・じょ・し}.  There are many particles that can be used in this way; probably more than is acceptable for the scope of questions on this site.  But some common ones are ね ("agreement"), か (question marker), わ (see this post), and な (prohibition).

