Integralism: this is pretty much a form of catholic social-theocracy. Catholicize Gaddafi's Libya and you might have a reasonable clue what this is about. At the same time, some integralism is clearly fascist, and the organizational structure of catholicism lends itself to a corporatist model. (The Holy See is technically a corporation-state after all, so one could argue the Vatican is corporatist to begin with)
Fascism: Fascism isn't about social welfare but an alternative solution to the class conflict proposed by Marxism. In practice, this solution is not social welfare but a repressive totalitarian state that puts the interests of the wealthy elites first and redivides the population along a national, rather than class basis. Fascism has always been capitalist.
National-Socialism: Nationial socialism has only historically existed in its fascist form.
In this form it is capitalist, not socialist, but makes a particular enemy out of Jews and the financial-capital class with which they were associated, as well as with socialists and especially Marxists. The nation is conceived of as subordinate to a dictator who represents the people of master-race.
In the alternative form which has never been achieved, it is a Strasserite-National Bolshevik state. It may have a revolutionary dictatorship at first but then in theory it organizes more similarly to a socialist state. Jews may or may not be hated on a biological basis but antisemitism takes on the rhetoric of the class conflict in Marxism. Some modern Strasserite groups now disavow antisemitism as being dated and unnecessary. Strasserites often denounce egalitarianism and feminism, may be white supremacist, and denounce liberal-style human rights. They are not generally accepted by the far-left and are a minority position on the far-right, meaning they remain a syncretic nationalist socialist position that few outside the bounds of the ideology tolerate or cooperate with.
National-Solidarism refers to several different ideologies. Some are Christian and nationalist and some support capitalism with heavy reforms and union power. Often they portray themselves as a third way between unbridled capitalism and Communism, but are heavily nationalistic as well.
Ba'athism is an anti-imperialist secular nationalist ideology with socialist roots. It is the ideology of Assad's Syria and was the ideology of Hussein's Iraq.
Maoism is not nationalist. It is patriotic, internationalist, and socialist. Maoism is distinct from Marxism-Leninism with Mao Zedong-thought, which was the ruling ideology of China under Mao Zedong, and was formulated by later Marxist theorists in South America.
Stalinism is a term used to describe the ruling policies of the Soviet government during the Stalin era. It can't really be properly understood as independent from Marxism-Leninism, and nor was it considered such at the time. It is also important to remember that Stalin did not, contrary to western popular belief, hold absolute power. Stalin was more like a president than a dictator in regards to his authority in the Soviet government, so many policies during the Stalin era were just the policies of the central committee, irrespective of Stalin's own personal opinions on what should be done. Marxism-Leninism is not necessarily authoritarian or nationalistic by the standards of liberal democracy, and many Marxist-Leninists fall into the lower left quadrant of the political spectrum. Indeed, Marxism-Leninism is typically anti-nationalist, favoring an international united struggle of the proletariat against capitalism.
Juche is a communist ideology that sees self-reliance as the path to global socialism and sees the collective action of massed humanity, not class struggle, as the driving force of progress. It is intensely anti-imperialist, and arguably nationalistic as it favors the self-reliance not only of the individuals but all countries, nations, and peoples. It was developed slowly and codified in 1982 by president Kim Il Sung of North Korea and remains the ideology of the Korean Workers Party, the party with 607/687 of the seats on the Supreme People's Assembly of the DPRK. Unlike Marxism, Juche sees a powerful leader as vital, and as such, president Kim Il Sung has great, if not technically absolute, influence over the Worker's party and the state. Closely connected is the Songun policy in the DPRK, which is essentially a military-first policy as a bulwark against imperialist interventionism. It is likely, however, that the Songun policy is being discontinued, as the DPRK now has a capable nuclear deterrent that should make imperialist intervention difficult.