Madoka×Nanoha by MASULAO MAXIMUM Nanoha Doujin and Puella Magi Madoka Magica Doujin — Ongoing

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Two of the most badass groups of magical girls join forces to defeat Walpurgis Night with the power of friendship! And planet-destroying lasers.

Chapter 1 by MASULAO MAXIMUM and MASULAO MAXIMUM released Sep 20 '11
Chapter 2 by MASULAO MAXIMUM and MASULAO MAXIMUM released Aug 14 '12
Chapter 3 by MASULAO MAXIMUM and MASULAO MAXIMUM released Jun 6 '13