It’s a little bit of a clunky system but there might be some info on Indians who served in Africa on the new Punjab and World War 1 database.
German Colonial Archive has some 1914-1918 information.
A collection of articles on World War 1 in Africa (Africabib.org)
Kingston Aviation has been posted in the past, but I think it was separate links. Now, everything is in one place. There are a couple of mentions of East Africa.
Organised by the British Council in Tanzania, a 2-hour webinar giving insight into the CWGC’s tracking down of missing names, Remembrance in Tanzania, including the Tanzania Legion Club and what is happening in Kenya and other places, is now available. It’s a packed 2 hours.
A 2018 edition of Nongqai is a special edition on South Africa’s Water Police, including SAP service during the war. It includes various photographs including of the SS Field Marshal leaving Durban with German prisoners of war in January 1919.
The British Overseas Railways Historical Trust has a few articles and publications on the Great War in Africa. Not listed on the Great War page is an article in journal 23 of 2001 on the Gold Coast Railways in 1917.
Photos of the Lake Tanganyika Expedition are available here – the complement the Lake Tanganyika Expedition 1914-1917: A primary source chronology published by GWAA.
Photos by Leo Walmseley –World War 1 glass slides, do you recognise the locations?