Windows
Minimum:
OS: Windows XP SP2 or better
Processor: Intel Celeron / Athlon Sempron or better
Memory: 1 GB RAM
Graphics: Open GL 2.0 compatible or better
DirectX: Version 9.0
Storage: 2 GB available space
Sound Card: N/A
Linux
Minimum:
OS: Ubuntu 14.04 (may work with others)
Processor: Intel Celeron / Athlon Sempron or better
Memory: 1 GB RAM
Graphics: Open GL 2.0 compatible or better
Storage: 1 GB available space
Sound Card: N/A
Mac
Minimum:
OS: Mountain Lion 10.8 or better for IDE (10.7 for compiled apps)
Processor: Intel Celeron or better
Memory: 1 GB RAM
Graphics: Open GL 2.0 compatible or better
Storage: 3 GB available space
Sound Card: N/A