Brazilian Orthodoxy looks like American Orthodoxy on a smaller scale. It was brought by immigrants, and then the first converts came either because of marriage or much simply because the church of the local area was Orthodox and they liked the community. Then later came organised missions and now jurisdictions are mixed.
Actual organised missions started in the 1980's, championed by the Metropolia of Western Europe (which was Old Calendarist) and the Syriac Orthodox Church. The Metropolia of Western Europe quickly split between the Portuguese Orthodox Church (a canonical autonomous church under the Polish Orthodox Church) and the Holy Synod of Milan (which is still Old Calendarist), and the Brazilian communities went under the Portuguese Orthodox Church, thus becoming the first organised canonical mission. It had its own mass conversions. I once heard D. Chrisóstomo say it looked like a new Pentecost.
After the Portuguese Orthodox Church broke up in the early 2000's, some parishes went to the Serbian Orthodox Church, which never became very missionary in character, but most went directly under the Polish Orthodox Church. The Greek Orthodox Church also has some missions, but nothing very organised or well structured, although I did hear of a mass conversion. The Antiochian Orthodox Church is a bit messy, but it has its own missions despite the lack of incentives from bishops. The Russian Orthodox Church has started to see the fruit of its missionary champions over the last decade, and before that I already heard of the mass conversion of one or two Eastern Catholic parishes, while more recently there was the mass conversion of an Old Calendarist community. There's also a large Ukrainian Orthodox community, but I don't really understand their canonical status: they're definitely under the EP, but I don't know whether directly, in an arrangement similar to the UOCUSA and the UOCC, or under the UOCUSA. I never heard of organised Ukrainian Orthodox missions, but I know some Brazilians do attend their churches. The OCA was once present, but its parish went under the MP. ROCOR had at least some two parishes, but they went under D. Agafângelo's pompously named PSCA schism. The PAOC keeps doing its mission, and there was at least two relatively recent mass conversions, one in a Native American tribe and one in a Syriac community.
Among the OO's, Syriacs still have very organised missionary work, but I don't know much about them. Copts and Armenians stick more to themselves. I've heard Ethiopians are starting to organise themselves, but they don't have a church yet. Old Calendarists are probably too disorganised to do any mission nowadays.
