Here is some valid information due to recent estimations and studies. You are welcome to list your own countries if you prefer to believe what comes from your head, but if you are a student or willing to find valid information this will be your first step.
1. South Africa: South Africa (South Africa has the most powerful army in Africa; it has more harmful weapons than any other country in Africa; it is the only African country that was trying to create the Nuclear weapon but was stopped by the US. The South African National Defence Force (SANDF) this includes: South African Army, South African Navy, South African Air Force and South African Military Health Service. South Africa has recently lower their budge on army from $7.21 billion 2003 to nearly $4 billion 2011. Trained by Israeli, and British, South African solders are more armed and more trained than any other country's soldiers.
2. Egypt: According to recent study, Egypt is considered to be the second most powerful country in Africa. For many years Egypt has been the first strongest country in the continent of Africa. With number of troops exceed that of South Africa, and more suppliers from countries such as United States, Russia, France,
China, Italy and United Kingdom, political instability has made an affect to Egyptian Armed Forces. This includes Egyptian Army, Egyptian Navy, Egyptian Air Force and Egyptian Air Defense Command. Egypt has increased their Armed Forces budget from $3.9 billion to $5.85 billion within the last five years.
3. Libya:
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Morocco:
5. Nigeria: Nigeria has the second largest army by number of troops, but due to political instability and lack of equipment Nigeria has appear to be the 5th strongest country in Africa. It has been estimated that in year 2013-2018 Nigeria may get weaker.
6. Tanzania: Tanzania has the most powerful army in East Africa; The Tanzania Peoples' Defence Force (TPDF) (Swahili: Jeshi la Wananchi wa Tanzania (JWTZ) the one defeated Idi Amin of Uganda with big help form Muammar Al-Gaddafi of Libya and . The Palestine Liberation Organization (PLO) The Tanzania People' Defence Force includes Land Forces Command, Naval Command, Air Force Command, and Military Intelligence. Julius Kambarage Nyerere (The first Tanzania's President) prepared president Laurent Desire Kabila of DR Congo to take over the powerful Mobutu Sese Seko Nkuku Ngbendu WA Zabanga; also prepared his son Joseph Kabila. Tanzania has trained Congolese solders in Tabora and Kigoma region for Kabila to return in Congo and take over power. Both Kabilas father and son were schooled and lived most of their lives in Tanzania before returning to Congo. Tanzania Also prepared Yoweri Kaguta Museveni who also schooled and lived in Tanzania before the Tanzania and Uganda war that resulted in defeating Dictator Idi Amin. Most Uganda leader got help from Tanzania before becoming leaders. This includes: Tito Lutwa Okello, Yusuf Kironde Lule, and Bazilio Olara-Okello. Recently, Tanzania did not want to send his solders in Somalia but offer training to Somali solders who will soon return to protect their country. Tanzania sent 924 soldiers to lead the African Union Solders in Comoros's Island to take Colonel Mohamed Bacar of Anjouan off power. Tanzania has the 3rd largest army in number troops after Ethiopia, and Eritrea, and recently considered the second in equipment after Kenya, but with more well trained troops. The recent estimation shows that Tanzania is the country in East-Africa followed by Ethiopia.
7. Ethiopia: Ethiopia once was considered the strongest country in East Africa. After continues civil war Ethiopia has gotten weaker. Ethiopia is still has the largest army by number of troops followed by Eritrea and Tanzania, and the 3rd in equipment after Kenya and Tanzania. 2011 Estimation shows, Ethiopia is spending 2.4% of its GDP in military. This includes: Ethiopia Army and Ethiopia Air Force.
8. Ghana:
9. Kenya: Kenya is the second strongest Nation in East Africa Economically after Ethiopia; it is the first in East African Community followed by Tanzania and Uganda. In 1981 Kenya was consider to be the 4th strongest nation in East Africa after Tanzania, Ethiopia, and Somalia. In 1994 Kenya was considered the 3rd strongest country in East Africa after Somalia and Uganda having both economic and political instability caused by war and dictatorship. The estimation indicates that Kenya will get even stronger within next 5-10 years. Kenya has the higher army budget in East Africa followed by Ethiopia. 2012 estimation shows Kenya is using 5.3% of its GDP in military. This includes: Kenya Army, Kenya Navy and Kenya Air Force.
10. Uganda: