Old School RuneScape is Jagex's official term for a previous version of the RuneScape game that was introduced from the August 2007 Archive of RuneScape, a backup of the RuneScape source code as it had been on 10 August 2007. It is also commonly referred to as OSRS or 2007scape.
Update:Old School RuneScape on Steam - Out Now! - OSRS Wiki
Sins of the Father - OSRS Wiki
Lumbridge, Old School RuneScape Wiki
Ardougne - OSRS Wiki
Shop - OSRS Wiki
Old School RuneScape Wiki
Nulodion - OSRS Wiki
OSRS Wiki Book for Google Chrome - Extension Download
OSRS Wiki (@OSRS_Wiki) / X
Death - OSRS Wiki
Weapons - OSRS Wiki
Regicide - OSRS Wiki
OSRS Wiki (@OSRS_Wiki) / X