That’s what I’ve found in wiki: https://en.wikipedia.org/wiki/List_of_cryptocurrencies#Before_2013 . I’ve looked through coins and found out that the chronology of "borning" of first alts is the next one:
-   Namecoin (decentralized domain name management, 2011)
-   Litecoin (first memory-hard mining, 2011)
-   Peercoin (first proof-of-stake mining, created at the end of 2012)
-   Ripple (first release in 2012)
-   Primecoin (launched on 7 July 2013 by anonymous hacker and Peercoin founder Sunny King
-   Gridcoin (created on October 16, 2013 by Rob Halförd.)
-   Gogecoin ( introduced by Billy Markus and Jackson Palmer as a "joke" at the end of 2013, in December)