Care to make a quick resume of them ?
21 May 1849; Austrian Emperor Franz Joseph, likely as a matter of pride, refuses to bend knee and kiss the ring of Tsar Nicholas. Russian forces never invade Hungary, allowing the Hungarians to successfully break free of the Hapsburgs, which forces Austria into a more German-centric orbit. Großdeutschland is fairly inevitable with both Prussia and Austria fighting over Germany, as opposed to OTL's Austria which had to focus on half a dozen different territories, ethnicities, nationalisms, and religions.
20 May 1849; Heinrich von Gagern doesn't lead the remaining liberals out of the German parliament, divided it in two. Instead the parliament remains a united front of liberal and radical aggregation, granting legitimacy and support to the ongoing revolutions across the German states. When the reactionaries in Prussian push on the revolutionaries, the revolutionaries push back, and Berlin is toppled; even IOTL the Hohenzollerns were far from secure in their own kingdom during the 1848-49 period.
14 May 1849; When Frederick William issues a decree ordering the Prussian delegates to return from Frankfurt, they refuse. The Hanoverians and Saxons never issue their similar orders, and the parliament remains the political, and social, center of the German reform/revolutionary movement. Further Frederick William is publicly weakened by his inability to force his subjects to listen to him. Once again the spark for another Berliner Uprising is now there, and Frederick William is too weak at this point to resist such an insurrection.
10 May 1849; von Gagern doesn't resign as Minister of the Reich in response to Archduke John's refusal to condemn the Prussian intervention in the pro-imperial constitution uprisings in Saxony. See above for my earlier von Gagern POD.
10 May 1849; The approaching revolutionary peasant army reaches Düsseldorf in time to relieve the siege of the trapped revolutionary militia inside, as well as crushing the Prussian forces formerly besieging the fortress between the two. Almost all of the Prussian Rhineland is now in revolutionary hands. The revolutions in Baden, the Palatine, Hanover, the Hessian and Thuringia states, and potentially Saxony itself. The Großdeutschland German Confederation is retained in form, though now split between a weakened reactionary Prussia and Austria and a powerful (especially economically) liberal 'West Germany' along the Rhine with access to the North Sea.
4 May 1849; Neither Saxon King Frederick Augustus nor his conservative government manage to sneak out of Dresden to Königstein, which means no provisional revolutionary government is established in Dresden, and no de-legitimizing the Saxon pro-constitutional movement, and no Prussian intervention in Saxony (which domino-effect led to the other interventions). Eventually Frederick Augustus is forced to accept the
Paulskirchenverfassung, and soon Bavaria, Hanover, and other 'Third German' states follow, leaving out the reactionary Hohenzollerns and Hapsburgs as an impediment toward liberal unification. The latter two likely don't last long under such pressures.
23 April 1849; After the Hungarians retake Budapest Görgey is able to resist Kossuth's calls for the Magyars to capture Buda Castle, in which a small (less than 100 man,
iirc) Hapsburg garrison has holed up. The weary Hungarians are thus refreshed and ready to fight when the Austrians come back just weeks later, perhaps even launching offensives of their in the mean time. See the above for 'Hungary independent, Austria into Großdeutschland' scenarios.
21 April 1849; When Prussian King Frederick William dissolves both chambers of the Prussian Diet in response to that body's acceptance of the
Paulskirchenverfassung, and they're urging for him to do the same, Berlin once again rises up against the Hohenzollern reactionaries. Even if successful in putting them down Frederick William's position is now greatly weaker than it was at the same point IOTL, and he's never able to launch his interventions across the smaller German states. Once again the liberals win out in the long-run.
5 April 1849; When Austrian Emperor Franz Joseph orders all Austrian delegates to the German parliament return to Vienna, they refuse. See further above for similar, though later, POD involving the Prussians.
28 March 1849; The German parliament selects another prince to elect Kaiser instead of Frederick William. Alternatively Frederick William is still offered the crown; but instead of a hereditary crownm with a de-facto veto, the Kaiser is only an elected monarch, potentially with only a delaying veto. Either way Frederick William's rejection, or lack thereof ITTL, is less damaging to the German parliament, and another prince is found; likely at this point the crown would pass to Maximilian of Bavaria.
23 March 1849; Franz Joseph, once again out of pride, never sends word to Tsar Nicholas asking for Russian aid in putting down the Hungarian revolution. See above for potential and likely butterflies.
5 March 1849; When Franz Joseph announces in no uncertain language that, contrary to all expectations, the Voivodina Serbs would not be recognized as an autonomous kingdom within the empire, the Voidodinian Serbs and their allies from the Principality of Serbia across the border turn on the Hapsburgs instead of 'merely' ending their conflict with the Hungarians.
9 February 1849; When Russian forces from the Danubian principalities are invited into Transylvania by the counter-revolutionary Romanians and Saxons (ethnic Germans in Hungary) there, they are far more successful... at first. Then they are horribly devastated and routed by the Hungarians in a spectacular battle that drives the Russians back and reignites the Romanian revolutionary movement. Russia never intervenes in Hungary, and the Magyars now have much better odds of achieving their independence. See above once again for 'Budapest breaks from of Vienna' scenarios.
5 January 1849; Though the Austrians manage to take Budapest, they don't capture and execute Batthyány, who continues to rally moderates to join the revolutionary cause, and a much more charismatic persona than the often abrasive Kossuth. Again, Hungary free, Austria into Großdeutschland.
5 January 1849; Alternatively the Austrians never take Budapest, because Görgey resists his more moderately liberal-minded officers and doesn't make the Vác Proclamation, and therefore doesn't sit on the sidelines and essentially let the Austrians walk into the Hungarian capitol.
Shall I go on? Those are all just from the spring of 1849 - 1848 has many more potential PODs that could lead to a non-Prussian, liberal, Großdeutschland.
Not that likely if you want the liberal, non-Prusso-/Austro-centric version, though.
It depends on what the POD is and how the war plays out. I believe we've had this discussion before in fact in other threads.