Dubbed "The Original Chrono Trigger Fanfic", a pretty impressive piece of work. It was started in '98 and finished in '99. It follows the game fairly close, and adds some original characters here and there. With nineteen chapters plus a prologue and an epilogue, this is some hefty reading.
The siteThe download link is broken, but I have taken the liberty of copying everything and saving it as an Adobe PDF file, so if anybody wants a copy, let me know.