No Mongol Invasion means a greater multiplicity of rival principalities, yet it's hard to say if one would have ever gotten the upper hand over all the others. Probably not, not without some encouragement from without.
No 'Tartar Yoke' means no Alexander Nevskii, and no Grand Principality of Muscovy. Greater German/Scandinavian/Hungarian/Polish success in conquering eastward (instead of being driven west by the Horde)---possible coalescence of a greater Russian state in the mid-1400s in reaction to western pressure/intervention/conquest (the aforementioned 'encouragement' factor).
Novgorod still a rich, though fractured, republic, with possibly greater influence in the north.
Much stronger Orthodox tradition, greater church influence (possible theocratic government under a Metropolitan?). Kiev would be the natural center of this polity, with the possibility of extending influence over most of Ruthenia/modern-day OTL Ukraine.
Also, much stronger Christian presence in the Black Sea, especially the Crimea. More Genoese outposts and more successful Hungarian conquest of the Cuman and Pecheneg tribes lead to a coalescence of Russian authority (whenever it happens) further to the north, except in the case a somehow-resurgent Kievan Rus' (even possible?) or the aforementioned Metropolis of Kiev.