In addition to The African Wars, Chris Peers has also written a handful of interesting rulesets; I read his In the Heart of Africa decades ago when it was available on the Foundry website. I was alerted to the newer Death in the Dark Continent by Peter Dennis, the maker of Paperboys, who recently was inspired by Peers to create a new line of his beautiful paper figures.
Heart of Africa is a skirmish game with a maximum of around sixty figures a side; Death in the Dark Continent has similarities but uses up to nine multi-bases per unit - perfect for Paperboys, of course. Both are focused on the era of exploration - ie, interfering European and American busybodies with, in Peers's words, "a mad obsession for lakes and the sources of rivers," and a bewildering mix of African tribes and Arabs who regarded these goings-on with bemusement and increasing alarm.I first was introduced to this period by Larry Brom's classic The Sword and the Flame, 3rd edition, which includes a "reduced" variant called The Sword in Africa.
When I played Warhammer 40K, one of my favorite armies was the Catachan Jungle Fighters - basically WWII Australians with a touch of Vietnam movies. The 3rd-edition codexes for 40K were masterful examples of concision, compressing impressive amounts of backstory, pictures, rules and hobby ideas into 48 pages or less. Codex Catachan had a unique method of creating a jungle battlefield which I like to use even in non-40K games.