Shapiro, J. The Terrorist's Dilemma: Managing Violent Covert Organizations, PRINCETON; OXFORD: Princeton University Press, 2013. The book’s appendix provides a list of biographies written by formers extremists – Available here.
Connect Futures – Youtube-channel whose playlist #Formers features shorter interviews with former extremists,
Extreme Dialogue – Youtube-channel featuring interviews with former extremists.
Life After Hate – An organization working on countering right-wing radicalization, founded by several American former neo-nazis.
International Institute for Counter-Terrorism
International Centre for Counter-Terrorism
Institute for Strategic Dialogue (UK)
Radicalisation awareness network (RAN)