Freeciv 3.1.1 tech help (Civ1 ruleset)
Astronomy
* Allows Copernicus' Observatory.
Automobile
Increases the population's contribution to pollution.
Banking
* Allows Bank (with Marketplace).
Bridge Building
Allows roads to be built on river tiles.
Bronze Working
* Allows Colossus.
Ceremonial Burial
* Allows Temple.
Code of Laws
* Allows Courthouse.
Combustion
* Allows Barracks III.
Communism
* Allows Communism.
* Allows United Nations.
Computers
* Allows SETI Program.
Construction
* Allows Aqueduct.
* Allows Colosseum.
* Allows Fortress (with Land terrain and "Settlers" units).
Allows Settlers to build fortresses.
Currency
* Allows Marketplace.
Democracy
* Allows Democracy.
Electronics
* Allows Hydro Plant (with River and Factory).
* Allows Hoover Dam.
Flight
Decreases one-time revenue from new trade routes.
Genetic Engineering
* Allows Cure For Cancer.
Gunpowder
* Allows Barracks II.
Industrialization
* Allows Factory.
* Allows Women's Suffrage.
Population will start contributing to pollution.
Literacy
* Allows Great Library.
Map Making
* Allows Lighthouse.
Masonry
* Allows City Walls.
* Allows Palace.
* Allows Great Wall.
* Allows Pyramids.
Mass Production
* Allows Mass Transit.
Increases the population's contribution to pollution.
Medicine
* Allows Shakespeare's Theater.
Eliminates the risk of population loss from plague in all your cities.
Monarchy
* Allows Monarchy.
Mysticism
* Allows Oracle.
Improves the effect of Temples.
Navigation
* Allows Magellan's Expedition.
Nuclear Fission
* Allows Manhattan Project.
Nuclear Power
* Allows Nuclear Plant (with Factory).
Plastics
* Allows Space Component.
Increases the population's contribution to pollution.
Pottery
* Allows Granary.
* Allows Hanging Gardens.
Railroad
* Allows Darwin's Voyage.
* Allows Railroad (with Road, "Settlers" units, and Land terrain but no City center).
Allows Settlers to upgrade roads to railroads.
Decreases one-time revenue from new trade routes.
Recycling
* Allows Recycling Center.
Refining
* Allows Power Plant (with Factory).
Religion
* Allows Cathedral.
* Allows J.S. Bach's Cathedral.
* Allows Michelangelo's Chapel.
Robotics
* Allows Mfg. Plant (with Factory).
* Allows Space Module.
Space Flight
* Allows Space Structural.
* Allows Apollo Program.
Superconductors
* Allows SDI Defense.
The Republic
* Allows Republic.
Theory of Gravity
* Allows Isaac Newton's College.
University
* Allows University (with Library).
Writing
* Allows Library.