Decent commercial coffee marks are the Mbale Bugisu Coffee Factory and the Budadiri Coffee Factory - these are the names of mills where the coffee is prepared. Good Ugandan coffees are both unique among East African coffees and of intense character. Germany has been a strong buyer of Ugandas arabica crop but the outrageous jump in Java prices resulted in numerous containers appearing in the US as a Java substitute.
Coffees from politically unstable regions, especially East Africa, and the 10-year civil war in Uganda, bring up ethical issues. But the plain fact is this: coffee is a cash crop. It is grown by 300,000 small-holder farmers in Uganda. It is 95% of the Ugandan exports and 2,800,000 people rely on it for a living! Most production is Robusta, and the prices they get are low. Arabica coffee can get a better premium to the farmer, and of course quality also results in increased incentive.
Here's a 2012 travelogue from Uganda