To me, number 1 looks more like a Caladium than a Syngonium, but I am not sure. Number 2 is Calathea ornata. Number 3 is an Aglaonema, maybe Aglaonema 'Cory.' I don't recognize number 4.

I feel very sorry that i put wrong photo of my plants... but i do not know how to edit this post... sad

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

Here are better photos. the top one is the stems, looks like they flower pink or purple. I bought this recently and it is in bad shape. Trying to nurse it back. Any help on how to care for this would be helpful as well. Thank you