It's not that straightforward, really.
Under the current far-right government, legislation has been advanced that would probably stop "non-zionist" [read: ethnic equality] parties from even contesting elections. This may arguably see parties such as Hadash-Ta'al (progressive left and Palestinian Israelis) unable to compete at all.
Then you have stuff such as The Democrats - a merger between Meretz and Ha'voda (basically Israeli Labour; once the overwhelmingly dominant force in Israeli politics; Golda Meir, Yitzhak Rabin, Simon Peres, Ehud Barack and, for that matter: current president Herzog? All Labour figures!).
But those are at best mildly critical of current state conduct. When Yair Golan, Democrats leader, issued a sharp statement against what was happening in Gaza that included the phrase "killing children as a hobby" the internal backlash was so harsh that he did a more or less immediate correction to "I obviously only meant the government and not the IDF whose soldiers do the actual shooting".
Then you have figures like Benny Gantz and Gadi Eisenkot (both briefly part of the war cabinet during the ongoing situation), Avigdor Lieberman (once considered hard right - overtaken by the current lot). They are by and large no less hardline but prefer softer or slightly softer rhetoric.
No good prospects in sight, I'm afraid.