2: possibly Haworthia cuspidata or something similar (https://worldofsucculents.com/haworthia-cuspidata-star-window-plant/)

4: Kalanchoe marnieriana (https://worldofsucculents.com/kalanchoe-marnieriana-marniers-kalanchoe/)

6: Delosperma echinatum “Pickle Plant”

(https://gardeningcalendar.ca/articles/how-to-grow-and-care-for-the-adorable-pickle-plant/)

8: Sedum rubrotinctum “Jelly Beans”

(https://www.guide-to-houseplants.com/sedum-rubrotinctum.html)

9: Cotyledon papillaris

(https://worldofsucculents.com/cotyledon-papillaris/)

11: Difficult to determine exact species

since it’s still to young, but this article should help when it gets bigger. https://davesgarden.com/guides/articles/view/1441

13 & 15: Senecio articulatus “Candle Plant”

(https://plantcaretoday.com/senecio-articulatus.html)

14: Possibly an adromischus, but which one: cristatus “key lime pie,” var. zeyherii, or var. clavifolius…?

17: Various names

http://www.llifle.com/Encyclopedia/SUCCULENTS/Family/Aizoaceae/27710/Corpuscularia_lehmannii

18: Kalanchoe fedtschenkoi variegata “Aurora Borealis”

(https://worldofsucculents.com/bryophyllum-fedtschenkoi-variegata-aurora-borealis/)