#3 is a Xerosicyos danguyi. It is a vine that grows in the thorn forest of southern Madagascar.
#1 might be a Tradescantia - are the leaves hairy? Hard to tell from the picture, but those little boat shaped leaves remind me of Tradescantia.
1)Tradescantia navicularis
2) Cotyledon orbiculata var. oblonga 'Macrantha' (this is the most similar I found the othe cotyledon orbiculata have completely different leaves)
3) Xerosicyos danguyi but Dischidia nummularia is very similar (how can I distinguish them ???)
2 is not 'Macrantha'. Have you checked Cotyledon elisae? The darker red and fairly dainty dimensions lead me that direction. (I have about 10 different C orbiculata varieties but this most resembles my C elisae from the Huntington.)