There is an outfit at Lokichoggio (Northern Kenya) called "748" - good operators, good a/c. There is also Phoebus Appollo (Marius Scmit) and Interflight Swaziland (Andre Vigano) in South Africa.
Rossair operate DC3' and Beech 1900's - again very good operators ex-lanseria South Africa.
Solenta Aviation (Bruce Jophson), Ed's Charters (Ed Mordt) and Bon Espoir (Rob Killick) all operate nice caravan's ex-Zimbabwe and South Africa.
Aslam Kahn at Aircraft Leasing Services Niarobi (Wilson Airport)has some nice King Airs