| List of Centuries | The timelines of the ever-expanding Wikipedia |
| HistoryOfScience.com | History of Science, Medicine, and Technology |
| Timeline Index | Many timeline cross-sections of history. Lots of interesting timelines from way way back to the present. |
| Maps of War | History maps and timelines of religion, conquest, governments, etc. |
| A Timeline of Symmetry in Physics, Chemistry, and Mathematics | A very well-researched timeline that I very much recommend. Also contains links to biographies as I have done in my timelines. Great to see such resources. |
| A Timeline of Mathematics and Theoretical Physics | Names and accomplishments in math and theoretical physics in the 20th century. |
| wikiTimeline | A interesting general time-lining project. |
| Timeline of Romani History | |
| History Topics in Mathematics | Historical chronologies of many areas of mathematics. Great stuff! |
| HyperHistory Online | A hypertext version of their famous wall-chart of history. Filled with lots of facts and a great resource, but a bit hard to find a specific history. |
| Chronology of Magnetospheric Exploration | List of major events from 1600 to present, mostly in the 20th century, of course. |
| A Timeline of Electricity and Magnetism | As the author says, "Mostly from E. T. Whittaker's 'A History of the Theories of Aether and Electricity'" going from 900 b.c. to 1905 a.d. |
| Physics Time-Line | Lots of dates listed, but the quality is lacking in parts. Difficult to sort things out. |
| The History of Mathematics | Seems like a good site, with lots of math info. |
| Timeline of Microcomputers | Fun romp through the history of microcomputers. |