IF Wiki lets anybody create (and play) Adventure Games online. It combines Wikis with Interactive Fiction, so players can also author games. The technologies involved are ASP.net MVC, Markdown and JQuery.

Interact is an Interactive Fiction (a.k.a Text Adventure) engine written in C# that can be used to program classic text adventure using any .NET language.

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.

Pruebas is an open source game mix of text adventure and RPG written in Microsoft QBasic (under MS-DOS 6.22) that uses keyboard. Runs natively under MS-DOS and compatible OS like Windows (use emulators like DosBox to run it under BeOS, Linux, *BSD, etc).

Create text adventure games

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.