Department of Commercial Taxes, Government of Uttar Pradesh website has links like entry tax, UPGOV, searc dealer, search commodity, net payment of challans etc
It has GST act, rules, forms and notification links, Mock site for e-Return for Testing, Download VAT and CST gorms, RTI, Form 38 Download, E-return Filing, Apply Online for Registration with Commercial Tax etc
Web : http://comtax.up.nic.in/