What left ideologies can libertarianism coexist with? As a far left democratic socialist, I don't see any.
You might be surprised. Bleeding Heart Libertarians[0] is a good place to start. In the US, libertarianism has traditionally been more closely aligned with the right, but that's more or less an accident of history. There's room for disagreement of course (based mostly on how you define terms), but libertarians find plenty of overlap and disagreement with both the left and the right.
I mean, come on: http://bleedingheartlibertarians.com/2015/08/rich-plutocrat-...
The general name for ideologies of the left that incorporate libertarianism is libertarian socialism, and there's a lot of far-left libertarian ideologies within that scope of that label (probably the most widely recognizable by name being anarcho-syndicalism.)
My view at the time was that Libertarians were fiscally conservative and critical of large government while at the same time leftist in their view of individual rights and freedoms. Kind of a "stay out of my wallet and my bedroom" attitude.
But that's not really the mainstream view anymore and as many center oriented Republicans have stated I think a lot of 90's Libertarians feeling is that they didn't leave the Libertarian party so much as it left them.
There's also Georgism, admittedly.
No, its not. Libertarianism is an ideology that sometimes coexists with right-wing (including far-right) ideologies, but also sometimes coexists with left-wing (including far-left) ideologies.
People mainly familiar with American politics may be prone to confuse libertarianism with a far-right ideology, since the label is mainly used in the US by and about either the right-libertarian Libertarian Party or by a contingent within the right-wing Republican Party, a party which has more generally adopted, particulary over the last handful of decades, a lot of right-libertarian rhetoric.