The first one is Dracaena marginata (dragon tree.) http://www.gardenstew.com/plantstew/505867 The 3rd looks like a Hylocereus (dragon fruit.) http://www.cactus-art.biz/schede/HY...tus/Hylocereus_undatus/Hylocereus_undatus.htm You seem to be collecting "dragon" plants! LOL!
what help do you need Ed? we want to help but need a few words from you as to what you are looking for for help? the dracena looks fine to me. the aloe looks fine. the cactus looks a bit sad but I don't grow them. the peperomia looks about naked from the leaves i see on the soil pinch off the stems about 1/2 way back and give it a drink if it is dry. don't if it is not. or... get another plant and pop it in the pot?