MultiCor
Download v1.10 - I can count faster.

If you want to get really technical this program counts upwards and that's it. A little less technical is that it finds the factors of a number. The program is composed of 4 tests with results of the last 3 being based on the first test. Each test is designed to utilize more CPU cores than the previous test, in powers of 2.
Examples of results screens:

• Single Core [AMD Athlon 64 3200+ @ 2.0GHz]
• Dual Core [AMD Athlon 64 X2 4800+ @ 2.4GHz]
• Quad Core [Intel Core 2 Quad Q6600 @ 2.4GHz]

This program requires the Java Runtime Environment 1.6 or higher which can be found here.

ProgrammedChaos
Download v2.00 - Logical chaos.
A simple particle physics system based on electromagnetic forces is the basis of this benchmark. It simulates the interactions of a specified number of particles for a specified number of frames. Your score is the average framerate.

Examples of results screens:

• Single Core [AMD Athlon 64 3200+ @ 2.0GHz]
• Dual Core [AMD Athlon 64 X2 4800+ @ 2.4GHz]
• Quad Core [Intel Core 2 Quad Q6600 @ 2.4GHz]

This program requires the Java Runtime Environment 1.6 or higher which can be found here.