Here is a spreadsheet I've picked up and modified, edited and made additions to. I am by no means the author of this spreadsheet and claim no honours in its creation. It should be noted that alot, if not most of the values on proc-rates etc have been modified to fit another blizzlike 1x private server but it should for the most part be pretty accurate for Nostalirus aswell.
Link: (See edit #5)
Vido edited version of the sheet: (See edit #5)
If anyone find the spreadsheet useful, please comment and report the thread for sticky.
EDIT #1: I recommend that you download the sheet and use microsoft excel to work with it as I am not sure if it works in browser-form or with other editors.
EDIT #2: If anyone wants to make additions/corrections to the sheet, please do so but if you want to upload it, please make a note of the additions both in the "notes-tab" in the sheet and in the forum post.
EDIT #3: I would like to have some proc-data on various items such as Viskag, Ironfoe, Darkmoon Card: Maelstrom, Deathbringer etc in order to model them better in the sheet. In order to test proc-rate, it is important that you do this with only mainhand weapon equipped with a shield, otherwise addons such as proc-watch will also count your offhand attacks which will fuck up the data collected.
2016-01-01 - EDIT #4: Added a link to Vidos alternative version of the sheet that has had a few things adjusted and fixed.
2019-06-15 - EDIT #5: This sheet hasnt been updated in 4+ years while other theorycrafters have continusly been updating it. I recommend a Visit to the Fightclub discord hosted by Steppenwolf. There you will find sheets updated as late as 2019-04-13.