Blazer Browser - Has a guide that covers the Handspring Blazer web browser, including Blazer technical details and guidelines for optimizing content for the Blazer web browser.

Mazingo - A guide to create a Mazingo channel using their Text Service. Discusses submitting and testing your channel, basic PDA-friendly HTML design, and rich media channels.

Avantgo - Has a channel developer guide with HTML-based lessons to create and deploy channels that are optimized for mobile devices. Also has an HTML style guide covering various topics on authoring hypertext for mobile devices.

Pocket Internet Explorer - Information about Pocket Internet Explorer and how to create sites/pages for Pocket Internet Explorer. Includes articles on PocketASP, Active Server Pages, XML and XSL, and ActiveX.

NewBay -  Has a comprehensive software system called FoneBlog that allows mobile phone users to run websites by sending pictures, text and sound clips from their phone.