#1, #2, and the two in #5 are all "notgeld", emergency non-government-issued money issued by cities and towns during and after WWI. You won't find them in regular banknote catalogues or websites.
#1 is German, from the city of
Speyer.
#2 and the #5s are Austrian (you can tell this because they're denominated in "heller", rather than marks and pfennigs). #2 is from Gozendorf castle, near the village of
Opping. The large one in #5 is from
Hinzenbach, I can't read the city-name on the smaller one.
#3 is from Laos, 20 kip, 1975-1979 series.
Banknotes.com page.
#4 is from
Kyrgyzstan, 1 tiyin, 1993 series.
#6 is Yugoslavia, as Fuzzy said.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis