The first one is a tanto. the third one is a style of parang, I think. The last one is a more modern "medieval" type.
My husband is a historical swordsmith who began making edged weaponry in the mid 1950s. He uses traditional methods of hammer, anvil and a coalfired forge to make these with. He uses Spring steel to make his blades with and tempers them using age old methods instead of furnace hardening. I met him in 1971 during a medieval reenactment event and so most of my blades were made by him.
So depending on what events we go to, I have a 1745 style Scottish dirk, a mid 9th Century Viking Age Seax and sword. An American Mountain Man era "hawk" and belt knife. Also a few axes, a spear and most anything else needed...we make ourselves