Serbo-Croatian
It is usually restricted only to conditional clauses. It is formed from a conjugated form of auxiliary verb biti ("to be") in the imperfective aspect plus past participle, which can be in any aspect and is conjugated for gender and number. Since Serbo-Croatian has a developed aspect system this tense is considered redundant.
Kad budem pojeo... ("When I will have eaten...")
Nakon što budeš gotov... ("After you will have been done...")
Read more about this topic: Future Perfect