The Orange Box (PC Digital Download)

Single-player
Cross-Platform Multiplayer
Steam Achievements
Steam Trading Cards
Captions available
Steam Workshop
In-App Purchases
Steam Cloud
Stats
Includes level editor
Includes Source SDK
Commentary available
Remote Play on Phone
Remote Play on Tablet
Remote Play Together
Family Sharing
Steam Timeline

Includes:
Half-Life 2
Half-Life 2: Episode One
Half-Life 2: Episode Two
Portal
Team Fortress 2
Note: Team Fortress 2 is now a Free-to-Play title