Thanks to people on comp.emacs newsgroup over the years (mostly 1999 to 2006), and also regulars on irc://irc.freenode.net/emacs channel in 2006, and many help from newsgroup gnu.emacs.help in 2008, and since.
I particularly like to thank the following people for support:
Kai Großjohann (author of many emacs packages), for many technical answers in comp.emacs from 1999‒2002.
… and more, especially many emacs developers in gnu.emacs.help in 2008. Any major specific help are listed at the particular page or source code. And i probably have missed a few. Please gently remind me if you got a chance.