8 Classic ruleset was freeciv's default ruleset until freeciv version 3.0,
9 where it got replaced by civ2civ3 ruleset.
12 Main differences to civ2civ3 (the default)
13 ------------------------------------------
15 - The Republic and Democracy have rapture growth enabled
17 - There's no Tribal, Fundamentalism, or Federation government types
19 - Government values are different, see help of each government type
21 - Settlers cost only one population
23 - Domestic trade routes are supported
25 - No unit pays upkeep in Gold
27 - There's no Fort or Airstrip extras
29 - There's no Tech Leakage
31 - There's no Tech Upkeep
33 - There's no Plague risk
35 - Terrain outputs are different, see help for each terrain type
37 - Wonders that need coastal city are available next to Lake tiles
39 - There's no pollution on Oceanic terrains
41 - City size does not affect defense bonuses
43 - There's no Mausoleum of Mausolos, Statue of Zeus, or Temple of Artemis
46 - Some wonders are made available from a different technology, see
49 - Engineers are always able to do all the terrain transformations,
50 there's no additional requirements for any of them
52 - There's no Food Waste
54 - There's no separate Wheeled units class, but all land units belong
57 - There's no units able to capture others
59 - Air units cannot pillage
61 - Helicopters cannot carry units
63 - Nukes can always move at full speed