I've know about Komodo IDE for a long time, but I only recently discovered Komodo Edit which is a free (as in beer) programmer's editor. I also just discovered that there's an Io language plugin for it (which is actually how I stumbed upon Edit).

I'm not a big IDE fan, but I've been wanting something a bit more modern than my usual editor Emacs for a while. Komodo Edit provides that plus features such as remote opening of files over SFTP.