My particular focus is on refugees that have fled the conflict. Kidnappings that have taken place in the neighboring countries and the fighting spreading.
You will find many documents about Boko Haram on the Web.
I am especially thinking to the publications of Marc-Antoine Perouse de Montclos. I attach here one of his publications in French, but he has also many references in English.
I am also thinking to Nicholas David (below, I copy some of his comments about the sources on Boko Haram, disseminated inside the Mega Chad network of researchers).
Besides, I think you already know the following website:
Campbell, John 2013 Nigeria: dancing on the brink. Updated ed. Council on Foreign Relations. Rowman & Littlefield. Nigerian political economy seen from the perspective of a historian and diplomat. Chapter 9 focuses on Boko Haram up to 2012.
http://www.chathamhouse.org/publication/nigerias-interminable-insurgency-addressing-boko-haram-crisis Marc-Antoine Pérouse de Montclos' recent paper on Boko Haram is a must-read on the topic and provides much valuable contextual information.
http://hudson.org/content/researchattachments/attachment/1393/ct_16_posting.pdf. This contains Jacob Zenn's 2014 article on "Nigerian al-Qaedaism", which nicely complements Pérouse de Montclos' paper though not always without disagreements.
http://www.bbc.com/news/world-africa-30794829 An example of the reporting of Will Ross, BBC News's main resident representative in Nigeria: "Boko Haram crisis: Why it is hard to know the truth in Nigeria". Work well worth following.
Ngassam, Rodrigue Nana "Boko Haram invades Cameroon". Le Monde diplomatique (English edition), no 1501, January 2015, pp. 4-5. A very useful source of information on Boko Haram's increasing assault against the Far North region of Cameroon. We sense a certain lack of evidence behind some of his statements.
www.mandaras.info The Information to Share section of this website maintained by anthropologist Gerhard Müller-Kosack includes up-to-date information, providing access to original sources, on BH attacks and related events in and around the Mandara Mountains since 2012.
www.nigeriawatch.com A careful, and so not very up-to-date, compilation of data on violent deaths in Nigeria.
Koungou, Léon 2014. Boko Haram: le Cameroun à l'épreuve des menaces. Paris : l'Harmattan. We have just obtained this as an ebook from the publisher.
An internet search for "Boko Haram on YouTube" can help those not familiar with this part of the world to visualize its landscapes and peoples. The videos also provide evidence of the horrors and atrocities committed by both sides in the conflict.
Mega-Tchad members are reminded also of J.-P. Olivier de Sardan’s thoughtful account of recent events in Niger, previously circulated on the listserver.
BHVR welcomes your suggestions regarding additional sources (preferably in English, French or German, but we will attempt other languages), not neglecting material from or relating to Niger, Cameroon and Chad.