As we know, there are some open problems of formal languages. I am wondering if there is a somehow complete list of open problem of formal languages. If there isn't such a list, can we make it one as answer?
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1$\begingroup$ You might also want to try asking at cstheory.stackexchange.com $\endgroup$ – Joel Reyes Noche Jun 17 '13 at 4:26

1$\begingroup$ Now also at cstheory.stackexchange.com/questions/18422/… $\endgroup$ – Joel Reyes Noche Jul 22 '13 at 3:50
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Here is a link which describes some of the open problems:

1$\begingroup$ Perhaps related: open problems (as of 2010) on combinatorics on words: cs.uwaterloo.ca/twiki/view/CoWiki/ImportantOpenProblems $\endgroup$ – Joel Reyes Noche Jun 23 '13 at 0:42