you can download a trial version. But I thinks it's rather expensive:
KDGantt follows the same pricing model and license agreement that Nokia uses. Per developer / platform licensing, each developer licensed to use KDGantt on a certain platform may use the software on any number of computers running this platform, but other developers working on the same computers may not, unless they have their own licenses. There are no runtime/royalty fees for applications built and deployed using KDGantt. You may ship the binary library together with any number of your application(s) for the platform your license is assigned to.
One (1) KDGantt license for single platform ----------------- $1600.00 US
UNIX/Linux or Mac or Windows, chose one platform
One (1) KDGantt license for duo platform -------------------- $ 2400.00. US
UNIX/Linux or Mac or Windows, chose two platforms
One (1) KDGantt license for trio platform --------------------- $ 3200.00. US
UNIX/Linux, Mac and Windows, all three platforms