You can find our demo pages here.
However, if you would like to test Tickera's back end and see how the whole thing works, you can request an access to our fully featured, fully functional playground version of Tickera here.
Also, you can find a free version of Tickera in WordPress plugin repository. Free version has completely the same core functionality like any of the premium ones but lacks support for most payment gateways and does not include any add-ons. Nevertheless, it comes quite handy if you want to test how it blends in with your theme and to get better insight on its working on your own website.