Staghorn fern. Cool plant. Here is a link that might be useful: photo of a staghorn fern

I agree with Zeck's ID on #3. Mammillaria spinosissima 'Un Pico' & #12. (Have yet to look at others) Thanks for the additional pix. On your 2 added plants, 1st of those is Rhipsalis paradoxa, Chain Rhipsalis/Link Rhipsalis & the other is a Sempervivum (hard to say which species). When you give a link (your drop box urls), you can copy/paste them into the box below where you are typing this (Optional Link URL) & give it a name "my plants" (etc.). Like I did for you again, below. Shortens the steps for others to take in order to see your plants. =) Oh! And THANK YOU for numbering your plants & the large rez pix. That is VERY helpful! Here is a link that might be useful: your plants #2

I think #1 is Milo http://www.ctahr.hawaii.edu/forestry/trees/CommonTreesHI/CFT_Thespesia_populnea.pdf

I think your K. delgoensis is Bryophyllum daigremontianum, commonly called "alligator plant".