I am not sure of the name of the top 2. Perhaps some of you have a suggestion? The second could be Anuraeopsis. the first looks a bit like Asplanchna but is quite different from the ones I know.
The bottom one is Brachionus. It is infested with fungi and I think the alga it is holding is also victim of a fungal parasite.
I think I have to callibrate my screen. the images are not as neutral as they can be.
Images made through a microscope. All subject types.