Governments have tried plenty of ways of raising money other than tax (inflation is the classic one), but I don't think we have found a better way. While governments are not nimble, they have had a long history of testing alternative ways of paying for the things other than taxes and so far all have proved worse in the long term.

The one exception to all of this is war where people will effectively donate by buying things like war bonds or agreeing to charge non-market rates for goods, but as a solution for taxation war is hardly ideal. As I said I hate taxes, but I hate no taxes more.