This is thread dedicated to worship of our Tech Tree ;^)
No other games even modded ones have that many techs and that big tech tree.
13 eras.
942 techs spread over 160 columns.
And this game isn't even fully developed! We could have end up with nice 1000 techs
Era - Era Column Start - Amount of columns and techs - Techs/Column
Prehistoric - x = 1, 18 columns and 98 techs. That is 5.44 techs per column.
Ancient - x = 19, 13 columns and 93 techs. That is 7.15 techs per column.
Classical - x = 32, 9 columns and 60 techs. That is 6.67 techs per column.
Medieval - x = 41, 9 columns and 54 techs. That is 6.00 techs per column.
Renaissance - x = 50, 11 columns and 59 techs. That is 5.36 techs per column.
Industrial - x = 61, 10 columns and 67 techs. That is 6.70 techs per column.
Atomic - x = 71, 15 columns and 102 techs. That is 6.80 techs per column.
Information - x = 86, 13 columns and 79 techs. That is 6.08 techs per column.
Nanotech - x = 99, 11 columns and 85 techs. That is 7.72 techs per column.
Transhuman - x = 110, 13 columns and 76 techs. That is 5.85 techs per column.
Galactic - x = 123, 14 columns and 65 techs. That is 4.64 techs per column.
Cosmic - x = 137, 11 columns and 51 techs. That is 4.64 techs per column.
Transcendent - x = 148, 12 columns and 52 techs. That is 4.33 techs per column.
Future - x = 160, 1 columns and 1 tech. That is 1 tech per column.
You can have up to 10 techs per column.
Average for whole tech tree not counting Future Era is 5.89 techs per column.
941 tech buttons - some religious techs are in modules, and there are 5 special purpose techs.

There is 11 Punks, 29 Religions and 2 Special techs scattered across tech tree.
Prehistoric - 3 R and 1 P -> 4 absolutely non mandatory.
Druidic Traditions, Shamanism, Tengriism
Megafauna Domestication
Ancient - 10 R -> 10 absolutely non mandatory.
Mesopotamism, Yoruba, Shinto, Ngaiism, Andeaism, Zoroastrianism, Judaism, Hinduism, Canaaism, Kementism
Classical - 8 R, 1 S -> 9 absolutely non mandatory.
Rodnovera, Asatru, Buddhism, Hellenism, Naghualism, Confucianism, Taoism, Jainism
Waterproof Concrete - requires building.
Medieval - 3 R, 1 P -> 4 absolutely non mandatory.
Christianity, Islam, Voodoo
Clockpunk
Renaissance - 1 R, 1 S -> 2 absolutely non mandatory.
Sikhism
Lead Glass - requires building.
Industrial - 2 R and 1 P -> 3 absolutely non mandatory.
Baha'i, Mormon
Steampunk
Atomic - 2 R and 2 P -> 4 absolutely non mandatory.
CaoDai, Scientology
Dieselpunk, Atompunk
Information - 0 P -> 0 absolutely non mandatory.
Memes aside this era is bit boring
Nanotech - 2 P -> 2 absolutely non mandatory.
Biopunk, Nanopunk
Transhuman - 2 P -> 2 absolutely non mandatory.
Crystalpunk, Cyberpunk
Galactic - 1 P -> 1 absolutely non mandatory.
Spacepunk
Cosmic - 1 P -> 1 absolutely non mandatory.
Starpunk
Transcendent - Nothing. Or everythingpunk?
Eras with most to least techs (adjusted for dead end techs):
Atomic - 102 (98) techs.
Prehistoric - 98 (94) techs.
Ancient - 93 (83) techs.
Nanotech - 85 (83) techs.
Information - 79 (79) techs.
Transhuman - 76 (74) techs.
Industrial - 67 (64) techs.
Galactic - 65 (64) techs.
Classical - 60 (51) techs.
Renaissance - 59 (57) techs.
Medieval - 54 (50) techs.
Transcendent - 52 (52) techs.
Cosmic - 51 (50) techs.
Fun fact:
Vast majority of techs will be researched two eras later.
There is plenty of techs, that can wait one era though.
Excluding religions, punks, and few other techs (Megafauna Domestication, Waterproof Concrete and Lead Glass) all techs will be eventually researched.
Techs, that won't be researched (if you don't choose them), if you reach X lifestyle (only listing techs with at least two eras of space):
Classical Lifestyle:
Prehistoric - Feline/Elephant/Camelid Domestication, Animal Riding.
Medieval Lifestyle:
Prehistoric - Feline/Elephant/Camelid Domestication, Animal Riding.
Ancient - Mummification, Soap/Candle Making, Veterinary Medicine.
Renaissance Lifestyle:
Prehistoric - Camelid Domestication.
Ancient - Mummification.
Classical - Mounted Archery.
Industrial Lifestyle:
Ancient - Mummification.
Medieval - Fire Brigades, Crop Rotation, Commercial Whaling.
Atomic Lifestyle:
Renaissance - Oil Painting, Free Artistry, Mine Warfare, Hot Air Balloon.
Information Lifestyle
Industrial - Meteorology
Those lifestyle techs below have OR requirements.
None to all of those techs might be researched by selecting one OR prereq (in bracket OR prereq, that doesn't require this tech down in tech tree).
Nanotech Lifestyle <Genesis Biology OR Graphene Alloys OR Disaster Robots>:
Atomic - Radioastronomy (1, 3), Lunar Exploration (1, 3), Astrobiology (1, 3), Astrogeology (1, 3).
Transhuman Lifestyle <Cloaking OR Personal Robots OR Lunar Trade OR Supercharged Crystallography OR Designer Microbiology OR Hypothetical Biochemistry>:
No tech left behind for two eras.
Galactic Lifestyle:<Nuclear Pulse Propulsion OR Nanotroids>:
No tech left behind for two eras.
Cosmic Lifestyle: <Neutrino Communications OR Folding Space>:
No tech left behind for two eras.
Transcendent Lifestyle: <Mensiokinesis OR Fantasy Materials OR Grand Unification Biology OR Stable Time Loops OR Cosmic Engineering or Tachyon Communication>:
No tech left behind for two eras.
Tech tree in video
No other games even modded ones have that many techs and that big tech tree.
13 eras.
942 techs spread over 160 columns.
And this game isn't even fully developed! We could have end up with nice 1000 techs

Era - Era Column Start - Amount of columns and techs - Techs/Column
Prehistoric - x = 1, 18 columns and 98 techs. That is 5.44 techs per column.
Ancient - x = 19, 13 columns and 93 techs. That is 7.15 techs per column.
Classical - x = 32, 9 columns and 60 techs. That is 6.67 techs per column.
Medieval - x = 41, 9 columns and 54 techs. That is 6.00 techs per column.
Renaissance - x = 50, 11 columns and 59 techs. That is 5.36 techs per column.
Industrial - x = 61, 10 columns and 67 techs. That is 6.70 techs per column.
Atomic - x = 71, 15 columns and 102 techs. That is 6.80 techs per column.
Information - x = 86, 13 columns and 79 techs. That is 6.08 techs per column.
Nanotech - x = 99, 11 columns and 85 techs. That is 7.72 techs per column.
Transhuman - x = 110, 13 columns and 76 techs. That is 5.85 techs per column.
Galactic - x = 123, 14 columns and 65 techs. That is 4.64 techs per column.
Cosmic - x = 137, 11 columns and 51 techs. That is 4.64 techs per column.
Transcendent - x = 148, 12 columns and 52 techs. That is 4.33 techs per column.
Future - x = 160, 1 columns and 1 tech. That is 1 tech per column.
You can have up to 10 techs per column.
Average for whole tech tree not counting Future Era is 5.89 techs per column.
Spoiler Tech tree as of SVN 11094 :
941 tech buttons - some religious techs are in modules, and there are 5 special purpose techs.

There is 11 Punks, 29 Religions and 2 Special techs scattered across tech tree.
Spoiler :
Prehistoric - 3 R and 1 P -> 4 absolutely non mandatory.
Druidic Traditions, Shamanism, Tengriism
Megafauna Domestication
Ancient - 10 R -> 10 absolutely non mandatory.
Mesopotamism, Yoruba, Shinto, Ngaiism, Andeaism, Zoroastrianism, Judaism, Hinduism, Canaaism, Kementism
Classical - 8 R, 1 S -> 9 absolutely non mandatory.
Rodnovera, Asatru, Buddhism, Hellenism, Naghualism, Confucianism, Taoism, Jainism
Waterproof Concrete - requires building.
Medieval - 3 R, 1 P -> 4 absolutely non mandatory.
Christianity, Islam, Voodoo
Clockpunk
Renaissance - 1 R, 1 S -> 2 absolutely non mandatory.
Sikhism
Lead Glass - requires building.
Industrial - 2 R and 1 P -> 3 absolutely non mandatory.
Baha'i, Mormon
Steampunk
Atomic - 2 R and 2 P -> 4 absolutely non mandatory.
CaoDai, Scientology
Dieselpunk, Atompunk
Information - 0 P -> 0 absolutely non mandatory.
Memes aside this era is bit boring

Nanotech - 2 P -> 2 absolutely non mandatory.
Biopunk, Nanopunk
Transhuman - 2 P -> 2 absolutely non mandatory.
Crystalpunk, Cyberpunk
Galactic - 1 P -> 1 absolutely non mandatory.
Spacepunk
Cosmic - 1 P -> 1 absolutely non mandatory.
Starpunk
Transcendent - Nothing. Or everythingpunk?
Eras with most to least techs (adjusted for dead end techs):
Atomic - 102 (98) techs.
Prehistoric - 98 (94) techs.
Ancient - 93 (83) techs.
Nanotech - 85 (83) techs.
Information - 79 (79) techs.
Transhuman - 76 (74) techs.
Industrial - 67 (64) techs.
Galactic - 65 (64) techs.
Classical - 60 (51) techs.
Renaissance - 59 (57) techs.
Medieval - 54 (50) techs.
Transcendent - 52 (52) techs.
Cosmic - 51 (50) techs.
Fun fact:
Vast majority of techs will be researched two eras later.
There is plenty of techs, that can wait one era though.
Excluding religions, punks, and few other techs (Megafauna Domestication, Waterproof Concrete and Lead Glass) all techs will be eventually researched.
Techs, that won't be researched (if you don't choose them), if you reach X lifestyle (only listing techs with at least two eras of space):
Spoiler :
Classical Lifestyle:
Prehistoric - Feline/Elephant/Camelid Domestication, Animal Riding.
Medieval Lifestyle:
Prehistoric - Feline/Elephant/Camelid Domestication, Animal Riding.
Ancient - Mummification, Soap/Candle Making, Veterinary Medicine.
Renaissance Lifestyle:
Prehistoric - Camelid Domestication.
Ancient - Mummification.
Classical - Mounted Archery.
Industrial Lifestyle:
Ancient - Mummification.
Medieval - Fire Brigades, Crop Rotation, Commercial Whaling.
Atomic Lifestyle:
Renaissance - Oil Painting, Free Artistry, Mine Warfare, Hot Air Balloon.
Information Lifestyle
Industrial - Meteorology
Those lifestyle techs below have OR requirements.
None to all of those techs might be researched by selecting one OR prereq (in bracket OR prereq, that doesn't require this tech down in tech tree).
Nanotech Lifestyle <Genesis Biology OR Graphene Alloys OR Disaster Robots>:
Atomic - Radioastronomy (1, 3), Lunar Exploration (1, 3), Astrobiology (1, 3), Astrogeology (1, 3).
Transhuman Lifestyle <Cloaking OR Personal Robots OR Lunar Trade OR Supercharged Crystallography OR Designer Microbiology OR Hypothetical Biochemistry>:
No tech left behind for two eras.
Galactic Lifestyle:<Nuclear Pulse Propulsion OR Nanotroids>:
No tech left behind for two eras.
Cosmic Lifestyle: <Neutrino Communications OR Folding Space>:
No tech left behind for two eras.
Transcendent Lifestyle: <Mensiokinesis OR Fantasy Materials OR Grand Unification Biology OR Stable Time Loops OR Cosmic Engineering or Tachyon Communication>:
No tech left behind for two eras.
Tech tree in video
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