Timelines under continual development by design.
Helpful maps for those who study the development of mathematics and science.
Home-brewed Chronologies:
Statistical Mechanics
and Thermodynamics
Hypercomplex Numbers Electromagnetic Theory
Chronologies From Elsewhere:
Wikipedia Timelines Timelines from the ever-expanding Wikipedia
History Topics in Mathematics Historical chronologies of many areas of mathematics. Great stuff!
List of Rulers of the Ancient Greek World From 500 to 55 BC, the rulers across Asia Minor, Egypt, Macedonia, Pergamon, Pontus, Baktria.
A Timeline of Symmetry in Physics, Chemistry, and Mathematics A well-researched timeline that also contains links to biographies as I have done in my timelines.
A Timeline of Mathematics and Theoretical Physics Names and accomplishments in math and theoretical physics in the 20th century.
Timeline of Personal Computers Fun and detailed romp through the history of microcomputers.
Computer History: A Timeline of Storage and Memory A history of storage and memory devices: Magnetic, optical and solid state.
Timeline Index Many timeline cross-sections of history. Lots of interesting timelines from way way back to the present.