Here are some proposed optional tech pages techs & their effects (mostly unlocking wonders that I've already proposed).
HAPPINESS TECHS
1. Fermentation
Requires: Agriculture
Effect: Allows construction of the following Building
Brewery (Building) + 5 Happiness, -5% production, city must have a source of wheat
2. National Broadcasting Networks
Requires: Mass Media
Effect Unlocks the following Wonders
Public Television Network (national Wonder): +10 happiness and +10% science for every city with a broadcast tower
CN Tower (Toronto): Cost of culture grabbing tiles -25% throughout the empire
3. Athletics
requires: Agriculture
Effect: unlocks the following building and wonder
Gymnasium (building): +1 happiness
Olympic Games:+ 1 happiness for every coliseum, gymnasium, and stadium in the empire
4. Modern Sports
Requires: Mass Media
Effect: unlocks the following wonders
Astrodome: + 10 Happiness, + 1 gold for every specialist in this city
Ericsson Globe: (Stockholm) +10 Happiness +1 gold for every stadium in the empire
5. Video games Industry
Requires: Computers
Effect: adds the following building and wonder
Video Arcade (building): +5 happiness, -10% production
Firaxis HQ: + 10 Happiness +10% gold and -10% production for every city
6. Digital media
Requires: internet
Effect: unlocks the following building and wonder:
Internet Café (building): + 5 happiness, +5 % Science, + 5% Gold, -10% production
Digital Media City Landmark Building (seoul): +1 Science for every Specialist in the city
COMMERCE TECHS
1. Terrace
requires: agriculture
Effect: +1 food on hills; unlocks the following Wonder
Banaue Rice Terraces:+2 food production in every square worked by this city (city must be within 2 hexes of a mountain)
2. Advanced Trade Networks
requires: Guilds
Effect: unlocks the following Wonders
Hanseatic League: +20% gold from trade routes (city must be built on the Coast)
Wieliczka Salt Mine: +1 production +1 Gold in every square worked by this city
Iwami Ginzan: +1 production for every citizen in this city (city must have a source of silver within its radius)
3. Modern Banking
requires: Corporations
Effect: unlocks the following Wonders
National Bank (national Wonder): +10 happiness + 10% Gold For city with a Bank
First Bank Building (Toronto): +10% Gold from trade routes
4. Insurance Industry
requires: Corporations
Effect: unlocks the following Wonder
Metropolitan Life Tower (NYC) + 10% food in every city +10% culture in this city
Transamerica Pyramid (san Francisco) +10% Food in every city, +1 Gold for citizen in this city
5. Early Skyscrapers
Requires: Corporations
Effect: Unlocks the following Wonders
The Auditorium Building (Chicago): +1 Science for every specialist in this city
Park Row Building (NYC): +1 Gold from every specialist in the city
The Woolworth Building (NYC): +10% Culture + 10% gold in this city
Empire State Building (NYC): immediately enter a golden Age, +1 Gold for every citizen in this city
6. Improved Skyscrapers
Requires: Early Skyscrapers
Effect: Unlocks the Following Wonders
World Trade Center (NYC): + 100% Gold from trade Routes
IDS Center (Minneapolis): + 100% Culture in this city
The Rialto (Melbourne): + 10% Gold in every city in the empire
7. Modern Skyscrapers
Requires: Improved Skyscraper and Globalization
Financial Center (Taipei): +1 Gold for every citizen in this city
Burj Khalifa (Dubai): Immediately enter a golden Age
Shard of Glass (London): -25% Unhappiness for number of citizens in the Empire
Messeturm (Frankfurt): +2 Happiness for every city connected to the Capital
Milad Tower (Tehran): Cost of culture grabbing tiles -25% throughout the empire
8. Tourism Industry
Requires: Advanced Flight
Effect: +10% Gold in every city with a wonder; Unlocks the following wonders
Akshardham: 1 gold 1 science for every citizen in this city
Disneyworld: -25% Unhappiness for number of cities in the empire
9. Automobile Industry
requires: combustion
Effects: +5 happiness for every Auto Plant; Unlocks the following Wonders:
Chrysler Building (NYC): + 10% production, +10% Gold for every city with an auto plant
Standard Oil Building (Chicago): +10% production +10% Gold for every city with an Oil Refinery
10. Business Logistics
requires: Corporations
Effect: allows for the following Building and Wonders:
Department store (building): +10% Food +1 gold for every 4 citizens
Sears Tower (Chicago): + 10% Gold For every Department Store in the empire
11. Sustainability
Requires: Ecology
Effect: Unlocks the following Wonders
Eden Project: 10% food in this city; +25% research in this city
Fuhrländer Wind Turbine (Laasow) +25% production in this city
12. Canned Foods
requires: refrigeration
Effect: +2 food for every Manufactory, Academy, Landmark, and Customs House
CULTURAL TECHS
1. Classical Engineering
Requires: construction
Effect: unlocks the following Wonders
Appian Way: faster movements on roads
Amphitheatre of El Jem: +4 happiness, + 20% culture in this city
Hadrian's Wall: +50% combat bonus vs barbarians
Pont du Gard: +1 food in every tile worked by this city
Ishtar Gate: Defensive Buildings 25% more effective
2. Islamic Architecture
Requires: Fundamentalism
Effect: Unlocks the following wonders:
Alhambra: 10% bonus to all defensive structures, +10% Culture in this city
The University of Sankoré: +1 Science for every 3 Citizens in this city,+25% Culture in this City
Saladin citadel: Defensive Buildings 25% more effective
The Blue Mosque:+1 culture and +1 science for every 2 citizens in this city
3. Greco-Buddhist art
requires: Classical Engineering
Effect: unlocks the following:
Buddhas of Bamiyan: +1 00% Culture in this city (city must be built within 2 hexes of a mountain)
Borobudur: -25% unhappiness for number of citizens
Kiyomizu-dera: +10 Happiness (City must be built on a river)
Sigiriya: +5 Happiness; + 50% culture in this city
Lumbinī: -25% unhappiness for number of cities
4. Gothic Architecture
Requires: Theology
Effect: unlocks the following Wonders
Ulm Minster (Ulm): enter a Golden Age
Cluny Abbey: Culture cost of adopting new policies reduced by 25%
Saint Sophia Cathedral (Kiev): -25% Unhappiness for number of cities in the empire
5. Early Monuments
requires: Mysticism
Effect: +2 culture for landmarks; unlocks the Following Wonders
King Ezana's Stele: +20% culture in every city in your empire
Moai Statues: +1 gold, +1 production, and +1 food in all ocean tiles in this city(must be built on the coast)
Church of Saint George (Lalibela): +2 culture for each temple
Masada: +100 great General emergence
6. Advanced Monuments
requires: Early Monuments
Effect: +2 culture for landmarks; unlocks the following Wonders
Jantar Mantar: +1 Science for every specialist in the city
Harmandir Sahib: +100% Great People growth in this city
Saint Catherine Monastery: +5 happiness;+ 1 culture for every 3 citizens in this city
Peterhof Palace:+25% Culture generation throughout your empire
7. Improved Monuments
Requires: advanced Monuments
Effect: +2 Culture for landmarks; unlocks the following Wonders
Neuschwanstein Castle: +10 Happiness
Mount Rushmore: culture cost of acquiring new tiles reduced by 75% in every city
The White City (of Tel Aviv): +20% production of all buildings in this city
8. Modern Monuments
requires: Improved Monuments
Effect: +2 Culture for landmarks; unlocks the following Wonders
Gateway Arch (St Louis): Enter a golden age
The Motherland Calls (Stalingrad): +50% Great General Generation
Bahá'í Terraces:+ 10% culture in all cities; + 5 happiness
Monument of Light (Dublin): + 5 happiness +100 culture in this city
9. Modern infrastructure
requires: railroad and electricity
Effect:+1 gold for Landmarks; unlocks the following Building and Wonders
Subway (building): +1 happiness; +1 gold per every 4 citizens in this city
Golden Gate Bridge: Empire enters a golden age
Channel Tunnel: +1 production, +1 Science, and +1 Gold for every plot worked by this city
10. Land Reclamation
requires: Modern infrastructure
Effect: unlocks the following building and wonders
Levee(Building): +1 production, +1 food in ever river tile
Palm Islands:+ 10 Happiness;+ 100% Culture in this city
Zuiderzee Works: +2 production from water tiles worked by this city
11. Motion pictures
Requires: Mass Media
Effect: unlocks the following building and wonder
Cinema: + 2 happiness; + 2 Culture; +1 gold for every 2 citizens in the city
Bollywood: Unhappiness from number of Citizens halved
12.National parks
requires: Nationalism
Effect: +2 culture for landmarks; unlocks the following Wonders
Yellowstone National Park + 10 happiness +10 gold on Old Faithful (must have Old Faithful in radius)
(Canadian) Museum of Civilization (national wonder): +50% culture + 50% science in this city
13. Televangelism
requires:National Broadcast networks
Effect:Unlocks the following Wonder
Hassan II Mosque: +100 Culture in this city (must be coastal)
SCIENCE TECHS
1.Ancient higher-learning institutions
requires: philosophy
Effect: +1 science per Academy; unlocks the following Wonders
Aristotle's Lyceum: + 100% science in this city
Nalanda University: +10% Science for every city
2. Fundamental research
requires: electricity
Effect: +1 science per academy; unlocks the following wonders
National Science Foundation (national Wonder): +10% research in every city
Library Tower (LA): +1 science for every citizen in this city
IBM Tower (Atlanta): +10% science in every city
Lomonosov University (Moscow): +100% Science in this City
3. Advanced Space Research
requires: Manned Spaceflight
Effect:+1 Science per Academy; unlocks the following Wonder
SETI project: +100% Science in this city
4. Advanced Medicine
requires

enicilin
Effects:+1 Science per academy; Unlocks the following wonders
National health Service (national Wonder): +25% food in every city, -10% Gold in every city (must have a hospital in every city)
Guy's Hospital: +25% food in this city, +1 science for every specialist in this city
MILITARY TECHS
1.Military Modernization
Requires: combustion
Effect: unlocks the Military Modernization great Project
Military Modernization (project): grants the blitz upgrade to any tanks, panzers, mechanized infantry, or Modern Armor that you build in the future
2. Military industrial Complex
requires: atomic Theory and fundamental Research
effect: +3 Science per Military Base, unlocks the following wonders
BREN Tower(Nevada Test Site): + 2 free Technologies
Henry J. Kaiser Shipyards: +25% production of Naval Units in this city (must be built on the cost)
Uralvagonzavod: +25% production of armored vehicles in this city
Boeing Aircraft Plant: +25% production of air units in this city
3. Modern Military Doctrines
requires: Military Science
effect: unlocks the following wonders
National Naval Academy (national wonder): +25 experiance for all future Naval units built in your empire (must be a coastal city)
National Air Force Academy (national Wonder): +25 experience for all future air units built in your empire
New Port News Shipyards: +25% production of Naval Units in this city (must be built on the cost)
Royal Military Academy Sandhurst: +25 experience for all future land units built by your country
Panzertruppenschule (Kama): +25 experiance for all future armored units built by your country