Games like Tom Clancy's Splinter Cell: Double Agent

If you finished Tom Clancy's Splinter Cell: Double Agent, the closest matches are Tom Clancy's Splinter Cell: Conviction, Metal Gear Solid: Portable Ops, Deceive Inc., CounterSpy and Sniper: Ghost Warrior 3. All 7 share its shooter genre and are ranked by how closely their themes and modes overlap.