Get a basic introduction to the elections, main candidates and electoral system from the BBC service
Independent Electoral Commission has the official facts. This includes information for voters as well as a researchers area with Risk maps
Nigeriaelections.org a project of the Department for International
Development (DFID/UKAID) and the West African NGO Network (WANGONeT) it has news and reports promoting free elections in Nigeria.
All africa.com aggregates news stories from a range of sources including African
Vanguard - Nigerian newspaper
Transition Monitoring Group (TMG) launched a unique Pre-Election Observation, PREO, in 2014 which surveys the situation and risk of political violence.
These organisations will be monitoring the conduct of the elections.
International Republican Institute
Nigerian Civil Society situation room - NGOs within Nigeria monitoring the conduct.
Council for Foreign Relations analysis.
International Crisis Group