Freeciv 3.1.4 tech help (Civ2 ruleset)
Amphibious Warfare
* Allows Port Facility (with Oceanic terrain).
Astronomy
* Allows Copernicus' Observatory.
Automobile
* Allows Super Highways.
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.
Communism
* Allows Communism.
* Allows Police Station.
* Allows United Nations.
Reduces the effect of Cathedrals.
Computers
* Allows Research Lab (with University).
* Allows SETI Program.
Construction
* Allows Aqueduct.
* Allows Colosseum.
* Allows Fortress (with Land terrain and "Settlers" units).
Allows Settlers and Engineers to build fortresses.
Currency
* Allows Marketplace.
Democracy
* Allows Democracy.
* Allows Statue of Liberty.
Economics
* Allows Stock Exchange (with Bank).
* Allows A.Smith's Trading Co..
Electricity
Improves the effect of Colosseums.
Electronics
* Allows Hydro Plant (with River and Factory).
* Allows Hoover Dam.
Engineering
* Allows King Richard's Crusade.
Environmentalism
* Allows Solar Plant (with Factory).
Feudalism
* Allows Sun Tzu's War Academy.
Flight
Decreases one-time revenue from new trade routes.
Fundamentalism
* Allows Fundamentalism.
Genetic Engineering
* Allows Cure For Cancer.
Gunpowder
* Allows Barracks II.
Industrialization
* Allows Factory.
* Allows Women's Suffrage.
Population will start contributing to pollution.
Invention
* Allows Leonardo's Workshop.
Laser
* Allows SDI Defense.
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.
Metallurgy
* Allows Coastal Defense (with Oceanic terrain).
Miniaturization
* Allows Offshore Platform (with Oceanic terrain).
Mobile Warfare
* Allows Barracks III.
Monarchy
* Allows Monarchy.
Monotheism
* Allows Cathedral.
* Allows Michelangelo's Chapel.
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).
Gives sea units one extra move.
Philosophy
* The first player to learn Philosophy gets an immediate advance.
Plastics
* Allows Space Component.
Increases the population's contribution to pollution.
Pottery
* Allows Granary.
* Allows Hanging Gardens.
Radio
* Allows Airport.
* Allows Airbase (with Land terrain and "Airbase" units).
Allows Settlers and Engineers to build airbases.
Railroad
* Allows Darwin's Voyage.
* Allows Railroad (with Road, "Settlers" units, and Land terrain).
Allows Settlers and Engineers to upgrade roads to railroads.
Decreases one-time revenue from new trade routes.
Recycling
* Allows Recycling Center.
Refining
* Allows Power Plant (with Factory).
Refrigeration
* Allows Supermarket.
* Allows Farmland (with Irrigation).
Allows Settlers and Engineers to upgrade irrigation systems to farmland.
Robotics
* Allows Mfg. Plant (with Factory).
Rocketry
* Allows SAM Battery.
Sanitation
* Allows Sewer System (with Aqueduct).
Seafaring
* Allows Harbor (with Oceanic terrain).
Space Flight
* Allows Space Structural.
* Allows Apollo Program.
Steam Engine
* Allows Eiffel Tower.
Superconductors
* Allows Space Module.
The Corporation
* Allows Capitalization.
The Republic
* Allows Republic.
Theology
* Allows J.S. Bach's Cathedral.
Improves the effect of Cathedrals.
Theory of Gravity
* Allows Isaac Newton's College.
Trade
* Allows Marco Polo's Embassy.
University
* Allows University (with Library).
Writing
* Allows Library.