GMT Games' East Front Series 

• Typhoon! (On GMT's P500 list to be redone as Typhoon! II)
• Barbarossa: Army Group South - errata, consolidated errata, Q&A (for Odessa tutorial), official errata, linking rules  
• Barbarossa: Army Group Center - official errata, rules (PDF file), linking rules
• Barbarossa: Army Group North - Tallin scenario (complete game), rules (PDF file)
• Kiev to Rostov (Planned, release date TBD) 

My Comments on AGS and the East Front System

Extract from AGN Play Book