Missional Challenge – I am not sure how you navigate this site but you can follow the links at the bottom of each page to hopefully find articles and blogs that interest you.
Growing Disciples – a blog on the Lifeway site, hosted by Claude King
discipleship.org – Bobby Harrington’s site. See the handbook, articles and “next steps”
Mentoring Waylon B. Moore’s site
To Be Like Him – disciple-making material, articles etc by Herb Hodges, Daniel W. Baugh and John Baugh
Core Discipleship – a process and lots of free resources
Operation Multiplication (Billie Hanks Jr)
Multiply – study material including videos for training disciple-makers