La villa del seis is a multiplatform point-and-click graphical adventure. Also, you can play it like a text adventure (interactive fiction) on a text browser (like Links, w3m or Lynx) or in a normal browser without JavaScript support.

Yasmina's Quest is an open source game (and motor) mix of graphical point-and-click adventure and text adventure written in PHP and DHTML (JavaScript, CSS and HTML) that uses mouse and keyboard optionally. You can use the motor/engine/parser to create your own adventure if you know PHP and JavaScript. Tested under BeOS, Linux, *BSD, Windows, etc.