GTD-R for Desktop is free Desktop cliant created in Adobe AIR. You can use almost the same functionality on the desktop.
If you want to sync with iPhone, please read "About Sync".

Note:
You must be connected to the Internet.
Please don't use Web and Desktop Version of GTD-R at the same time.
GTD-R for Desktop supports the following system configuration.

WINDOWS Intel® Pentium® III 1GHz or faster processor, 512MB of RAM Windows Vista™ Windows XP SP2 and SP3 Windows Server® 2003 Server Microsoft® Windows® 2000(Service Pack 4) MAC OS Intel Core™ Duo 1.83GHz or faster processor PowerPC® G4 1GHz or faster processor Mac OS X 10.4.11 or Mac OS X 10.5.4 and 10.5.5 512MB of RAM LINUX Intel® Pentium® III 1GHz or faster processor, 512MB of RAM Fedora 8, Ubuntu 7.10, openSUSE 10.3

When you click the right button displays the PDF manual. To view PDF Adobe Reader is required.