Brief summaries of each mod are below, sorted by the folder/category they are in.

ORIGINAL CREATIONS
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Agility Relics - Turns the Tenacity relics into relics that now boost movement speed and jump height (and their E-Tech equivalents.) Also has an option to replace the Otto Idol with a super-jump relic.
Backhand - Turns the Triquetra (or the Striker, Tidal Wave, or Hydra) into a shotgun that will thoroughly launch enemies away.
Bedrum - Turns the Lyuda into a laser light show (a souped-up Moloko basically.)
Chroma - Turns the Sand Hawk into a multi-elemental rainbow SMG.
Darlin' - Turns the Stomper into a Moxxi gatling gun.
Discipline - Turns the Law into a more useful Slag version of itself.
Electrum - Turns the Yellow Jacket into a tesla gun.
Entendre - Turns the Chulainn into a dual Slag/Explosive Moxxi SMG.
Melt - Turns the Hellfire into a duel Fire/Corrosive Plasma Caster.
'Merica - Turns the Flakker into a weapon that fires exploding red/white/blue eagles.
Osmosis - Turns the Transformer into an absorb shield that restores itself off of Damage-over-Time.
Punter - Turns the Hydra into a proper Hammerlock shotgun. Massive damage at the cost of other stats.
Quaker - Turns the Roaster into a rocket launcher suitable for rocket jumping.
Sasha - Turns the CHOPPER into a recreation of the Heavy's Minigun from Team Fortress 2.
Signature - Turns the Octo into a Moxxi shotgun.
Synergizer - Turns Logan's Gun into a strong version of a Synergy pistol (Vladof-barrel Hyperion pistol.)
Tomcat - Turns the Boom Puppy into a full-blown jetpack.
Toothprick - Turns the Buffalo into a very sharp, gun-shaped knife.
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BORDERLANDS 1 RECREATIONS
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Anaconda - Turns Gwen's Head into a recreation of the Borderlands 1 Anaconda.
Aries - Turns the Little Evie into a recreation of the Borderlands 1 Aries.
Bastard - Turns the Boom Puppy into a recreation of the Borderlands 1 Bastard.
BL1-Enhanced Ports: Turns the Gearbox Guns, Tidal Wave, Pocket Rocket, and Mongol into recreations of the legendary gearbox guns added in Borderlands 1 Enhanced, with some reimagining.
Classic Sledge - Turns Sledge's Shotgun into a recreation of the original Borderlands 1 Sledge's Shotgun.
Clipper - Turns the Tinderbox into a recreation of the Borderlands 1 Clipper.
Defiler - Turns the Infection into a recreation of the Borderlands 1 Defiler.
Destroyer - Turns the Actualizer into a recreation of the Borderlands 1 Destroyer (rifle).
Draco - Turns the Sawbar into a recreation of the Borderlands 1 Draco.
Firehawk - Turns the Little Evie (or Rubi) into a recreation of the Borderlands 1 Firehawk.
Friendly Fire - Turns the Teeth of Terramorphous into a recreation of the Borderlands 1 Friendly Fire.
Hammer - Turns the Landscaper (or Flakker) into a recreation of the Borderlands 1 Hammer.
Nemesis - Turns the "Shotgun" Fibber into a recreation of the Borderlands 1 Nemesis.
Reaper - Turns the Logan's Gun into a recreation of the Borderlands 1 Reaper.
Revolution - Turns the Shredifier into a recreation of the Borderlands 1 Revolution.
Violator - Turns the Pocket Rocket into a recreation of the Borderlands 1 Violator.
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PRE-SEQUEL RECREATIONS
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88 Fragnum - Turns the Unkempt Harold into a recreation of the Pre-Sequel 88 Fragnum.
Berrigan - Turns the Mongol into a semi-recreation of the Pre-Sequel Berrigan.
Boomacorn - Turns the Triquetra (or the Tidal Wave, Hydra, or Striker) into a semi-recreation of the Pre-Sequel Boomacorn.
Bright Spadroon - Turns the Crit into a semi-recreation of the Pre-Sequel Bright Spadroon.
Bullpup - Turns the Shotgun 1340 into a recreation of the Pre-Sequel Bullpup.
Cat O' Nine-Tails - Turns the Scorpio into a semi-recreation of the Pre-Sequel Cat o' Nine-tails.
Cheat Code - Turns the Bitch into a semi-recreation of the Pre-Sequel Cheat Code.
Company Man - Turns the Shotgun 1340 into a recreation of the Pre-Sequel Company Man.
Cyber Eagle - Turns the Judge into a recreation of the Pre-Sequel Cyber Eagle.
Fast Talker - Turns the Bone Shredder into a recreation of the Pre-Sequel Fast Talker.
Frostfire - Turns the Chulainn into a semi-recreation of the Pre-Sequel Frostfire.
Fusillade - Turns the Madhous! into a recreation of the Pre-Sequel Fusillade.
Hard Reboot - Turns the Thunderball Fists into a recreation (with a new skin) of the Pre-Sequel Hard Reboot.
Kaneda's Laser - Turns the Bunny into a semi-recreation of the Pre-Sequel Kaneda's Laser.
Laser Disker - Turns the Octo into a semi-recreation of the Pre-Sequel Laser Disker.
Longest Yard - Turns the Invader into a semi-recreation of the Pre-Sequel Longest Yard.
Longnail - Turns the Patriot into a recreation of the Pre-Sequel Longnail.
Luck Cannon - Turns the Rex into a semi-recreation of the Pre-Sequel Luck Cannon.
Moonface - Turns the Tidal Wave into a recreation of the Pre-Sequel Moonface. Also has an option to turn the Striker into the Flayer.
Ol' Painful - Turns the Shredifier into a recreation of the Pre-Sequel Ol' Painful.
Omni-Cannon - Turns the Longbow into a recreation of the Pre-Sequel Omni-Cannon.
Plunkett - Turns the Trespasser into a semi-recreation of the Pre-Sequel Plunkett.
Shield of Ages - Turns the 1340 Shield into a recreation of the Pre-Sequel Shield of Ages.
Smasher - Turns the starting pistol into a recreation of the Pre-Sequel Smasher.
T4s-R - Turns the "Critical" Fibber into a recreation of the Pre-Sequel T4s-R.
Thunderfire - Turns the Hellfire into a semi-recreation of the Pre-Sequel Thunderfire.
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REVAMPS
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Better Black Hole and Impaler - Revamps the Black Hole and Impaler to be able to better use their special effects.
Better Bones - Gives the Shock and Corrosive Bones of the Ancients each an extra element to boost (Explosive and Slag.)
Better Mysterious Amulet - Gives the Mysterious Amulet some actual benefits for wearing it, particualrly with friends.
Gearbox Guns Plus - Spices up the Gearbox guns you get at the start of a playthrough to be more useful and interesting.
Healthy Endowment - Makes the Moxxi's Endowment relic passively regenerate health and add life-steal to all damage you deal.
Honest Fibbers - Takes the lies out of the Fibber, and makes each Fibber variant distinct from one another.
Infinity Beyond - Reworks the Infinity to be a solid Anarchist with an incredible pistol ammunition regeneration rate, as well as a stellar skin.
Jakobs Order - Tweaks the Order to be a Jakobs shield similar to the Rough Rider, but with roid damage instead of damage resistance.
Lilith DLC Gear Tweaks - "De-clones" a lot of the gear added in the Lilith DLC and generally makes them more interesting.
Madhous Remastered - Reworks and reskins the Madhous!.
Teapot Remastered - Reworks the Teapot to no longer be a poor man's Hornet, and reskins it as well.
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ACCESSORIES
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Assault Shotguns - Makes the Hyperion shotgun barrel function similarly to Borderlands 1's Assault Shotguns.
Better Sights and Stocks - Makes the gun sights and gun stocks/exhausts actually give stat bonuses similarly to the weapon grips.
Burst-Fire Rockets - Replaces the accuracy accessory on rocket launchers with a burst-fire accessory similar to burst-fire launchers from Borderlands 1.
Double Anarchy - Makes the Bandit SMG barrel similar to the Borderlands 1 Anarchy barrel, and the SMG accuracy accessory similar to the Borderlands 1 Double accessory.
Heavy Shotguns - Replaces the Vertical Grip accessory with an accessory that increases pellet count by 50%, reduces fire rate and accuracy, and adds knockback.
Jakobs & Torgue E-Techs - Allows Jakobs and Torgue E-Tech weapons to spawn.
Lawed-&-Ordered-Up: Makes most bayonets and normal roid shields work like the Law and Order combo.
Mashers - Replaces the pistol Double accessory with the Masher accessory from Borderlands 1.
Plasma Pistols - Replaces Spikers with a plasma-launching pistol that can fire charged shots when zoomed.
Regen Snipers - Replaces the sniper rifle accuracy accessory with one that passively regenerates sniper rifle ammo.
Revolvers - Changes all Jakobs, Maliwan, and Torgue pistols to function like the revolvers of Borderlands 1.
Slug Shotgun Accessory - Changes the shotgun accuracy accessory to fire one powerful, accurate single pellet instead of multiple pellets.
Speed Shotguns - Changes the shotgun shell (general boost) accessory to boost movement speed.
Splitters - Turns Splat Guns into laser shotguns somewhat similar to the Pre-Sequel's Splitters.
Tediore REGENdaries - Makes Tediore Legendary weapons regenerate ammo of their weapon type (and makes the Avenger regen all gun ammo types.)
Tough ARs - Makes the assault rifle stability accessory boost damage resistance.
Vertical Grip Fix - Makes the Vertical Grip boost projectile count by 40% instead of by two pellets.
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PACKS
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Quadtastic - Turns most of the special shotguns in the game into Torgue-barrel versions of themselves.
Spintastic - Turns many pistols, assault rifles, and sniper rifles into Vladof-barrel versions of themselves.
Techtastic - Turns many assault rifles, smgs, and sniper rifles into E-Tech versions of themselves.
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RESKINS
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Bee-Themed Bee - Reskins the Bee...to the color of a bee.
Chopper-Style CHOPPER - Reskins the CHOPPER to have a skin similar to that of certain motorcycles.
Cobra-Plus - Reskins the Cobra to resemble the Borderlands 1 Cobra, as well as change the look of the gun barrel and make it Legendary rarity (skin is already included in the Unofficial Community Patch.)
Deliverence Alternative - Reskins the Deliverence to have a UPS-theme.
Goldfinger - Reskins the Godfinger to differentiate it from the Bekah.
Little Evie Alternative - Changes the pink parts of the gun to a blue.
Norfleet Plus - Reskins the Norfleet with a shiny different orange/black/silver color scheme and changes the rarity of it to Pearlescent.
Orphan Blinger - Reskins the Orphan Maker with some gold pirate bling.
PIMPernel - Reskins and renames the Pimpernel into a very swaggy reskin.
Seraph Skins DLC1-Style - Reskins the Hammerlock Seraph weapons to be similar to the Scarlett DLC seraphs.
Silver Fist - Reskins the Lady Fist with a sleek silvery skin.
Veruc Alternative - Reskins the Vruc to be more blue instead of purple.
White Death - Reskins and renames the Lyuda into the White Death.
Whitefork - Reskins the Pitchfork to be white instead of green.