Hello!
These babies are among my favourite altcoins.
I'm holding them as a long term investment mainly because I believe in the benefits that these projects will provide to our society. Ripple is a different story but nevertheless I see it a very good investment.
A special mention to Bytecoin (which is Monero's "dad") that I believe may be the most rewarding investment of them all. It's not too late to enter or to buy more at the right moment.
Let me know your thoughts in the comments.
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Websites
https://www.stellar.org/
https://bytecoin.org/
https://ripple.com/
https://www.digibyte.co/
http://bitbay.market/