Tickle your brains...

123456
Across
  1. 4. Join the firsts and think further! : G-Lion-India-Xamarin
  2. 5. Keller und Knappich Augsburg (Apply same logic as you did for another hint!)
  3. 6. Sreeni, Uma, Soma...
Down
  1. 1. Hemodynamic recording
  2. 2. Ertwhile ATM
  3. 3. Project name