O is for

  

OPEN

 Anika {Hipstamatic,Phonto, GifBoom} / Urban Muser {Camera+, Squara}

N is for

NOTE

 Urban Muser {Hipstamatic} / Anika {Hipstamatic, Blender, Snapseed, Pixlr-o-matic, Diptic}

M is for

ME

 Urban Muser {Camera+, Snapseed, Picture Show} / Anika {Hipstamatic, Blender}

L is for

LANDMARK

Urban Muser {Squara} / Anika {Hipstamatic, PS Express, Phoster, Squaready, Diptic}