Finding battletech fanfiction is never easy- it's spread thinly all over the internet. The recent forum trouble hasn't helped matters either. So here are a series of links. Some are to Battletech Fanfiction sites, some are to specific stories. All of the pure Battletech stories are of a decent length and a good quality- no short, poorly written fics on this list.
There is, towards the bottom, links to every Battletech crossover I can find which didn't make me want to claw my eyes out in agony.
Battletech Fanfiction Sites:
http://www.chignaguet.com/bt_fanfiction/index.html (Hasn't updated since 2006, but has some fics you can't find elsewhere)
http://www.fanfiction.net/game/Mechwarrior_Battletech/10/0/0/1/0/0/0/0/0/1/http://ourbattletech.com/forum/index.php (A site which I'm told is branching out to hosting alternate universes)
The Snowbirds series, by sentinel 28
(An orgional mercenary regiment, fighting during the clan invasion.)
http://www.fanfiction.net/s/1384908/1/Snowbird_Ascendanthttp://www.fanfiction.net/s/3510014/1/Snowbird_Summerhttp://www.fanfiction.net/s/3577775/1/Twycrosshttp://www.fanfiction.net/s/3626505/1/Snowbirds_Battalionhttp://www.fanfiction.net/s/3778963/1/9113064http://www.fanfiction.net/s/3759145/1/The_Falcon_and_the_Snowbirdhttp://www.fanfiction.net/s/3793768/1/Snowbirds_Interludehttp://www.fanfiction.net/s/3918683/1/Snowbird_Chainedhttp://www.fanfiction.net/s/4038877/1/Snowbirds_Revengehttp://www.fanfiction.net/s/4216106/1/Snowbirds_Rubiconhttp://www.fanfiction.net/s/4334029/1/The_Race_of_the_Snowbirdshttp://www.fanfiction.net/s/4589289/1/Snowbirds_Last_Standhttp://www.fanfiction.net/s/5234071/1/Snowbird_Triumphanthttp://www.fanfiction.net/s/6362289/1/Choosers_of_the_Slainhttp://www.fanfiction.net/s/6574813/1/A_Matter_of_JusticeThe works of drakensis, who seldom finishes a story, but always writes good ones.
http://www.fanfiction.net/u/347490/drakensisThe Taurian Gambit, where the Taurians get a new leader, with a new outlook.
http://www.fanfiction.net/s/6487894/1/The_Taurian_GambitOne Letter, where Janos Marik changes sides during the 4th succession war.
http://www.fanfiction.net/s/5807378/1/One_LetterA Victorian Age, where Victor Stiener-Davion is born a girl- and proves that girls are smarter than boys.
http://www.fanfiction.net/s/5373688/1/A_Victorian_AgeStar Adder Symphony, where Clan Star Adder decides to get in on Operation Revival.
http://www.fanfiction.net/s/4765870/1/Star_Adder_SymphonyRiding the Dragon, where an assassination replaces the Coordinator of the Combine with someone new, and the whole Sphere changes. (note: he actually finished this one!)
http://www.fanfiction.net/s/6817174/1/Riding_the_DragonAleksandr the Good, where Kerensky decides to stay in the Inner Sphere
http://www.classicbattletech.com/forumarchive/index.php?topic=62849.0Fragmentation, by Kickaha(aka EdBecerra), where a a periphery society really, really doesn't want the clan invasion to happen, and has the money to do something about it.
http://forums.spacebattles.com/showthread.php?t=139526http://forums.spacebattles.com/showthread.php?t=141770http://www.fanfiction.net/s/4639786/1/FragmentationWorks by master arminas
Kerensky and Kurita.
Stefan Amaris killed Richard Cameron, and took over the Terran Hegemony, and tried to kill all of the Camerons, to remove all possible contenders for the throne.
He missed one.
Stefan Amaris held important hostages from the successor states, to ensure they would obey him.
The Dragon refused.
Stefan Amaris thought he could conquer the Terran Hegemony, and hold it.
Aleksandyr Kerensky, Minoru Kurita and Stephen Cameron are about to prove him wrong.
http://www.fanfiction.net/s/4874898/1/Kerensky_and_Kurita_Book_I_of_the_Cameron_Legacyhttp://www.classicbattletech.com/forumarchive/index.php/topic,38124.0.htmlhttp://www.classicbattletech.com/forums/index.php/topic,9439.0.htmlThe Seeker
http://www.classicbattletech.com/forums/index.php/topic,8819.0.htmlOperation Revival Reborn
http://www.classicbattletech.com/forums/index.php/topic,9296.0.html(haven't read these yet, but given their author they're almost certainly excellent)
New World Order
*REWORKED* On a desolate world in the Periphery, long-hidden secrets and power beyond imagination are sought. And the universe will be changed forever... The final version, edited with dates and corrected battle reports!
http://www.fanfiction.net/s/251974/1/New_World_OrderSequel: Seekers in Shadow
http://www.fanfiction.net/s/953728/1/Seekers_In_ShadowCaspar Drone Warship Series
http://www.classicbattletech.com/forumarchive/index.php/topic,56974.0.htmlhttp://www.classicbattletech.com/forumarchive/index.php/topic,14177.0.htmlhttp://www.classicbattletech.com/forumarchive/index.php/topic,38637.0.htmlMechwarrior: Scorched Earth (by Big Steve, and possibly others)
A setting where a rift forms in the Huntress system, and in the Outreach system, linking both the Inner Sphere and the Kerensky Cluster to a war-torn world in another universe- Earth. Now, the Wolfs Dragoons help America (and possibly other countries) fight off the Smoke Jaguar Invasion.
(This is apparently a reboot of an earlier thread. Though Big Steve is the only one writing so far, he's encouraging others to join in.)
http://forums.spacebattles.com/showthread.php?t=197692 (Central idea thread)
http://forums.spacebattles.com/showthread.php?t=198163 (Small Victories, by Big Steve)
http://forums.spacebattles.com/showthread.php?t=198609 (Enemy at the gates, by Big Steve)
Hammer6R's work
Drakes Demons
http://floatingbadger.com/?page_id=151 (PDF)
http://www.classicbattletech.com/forumarchive/index.php?topic=60273.0Drumbeat (American Group Redux)
http://www.classicbattletech.com/forumarchive/index.php?topic=58756.0Deadborders work
http://www.fanfiction.net/u/649940/Deadborder (note: older versions of DeadBorder's work can be found here, along with several Zoids fics that have more in common with battletech than with the Zoids anime)
The Storm Riders series
http://www.classicbattletech.com/forums/index.php/topic,7252.0.htmlhttp://www.classicbattletech.com/forums/index.php/topic,7257.0.htmlhttp://www.classicbattletech.com/forums/index.php/topic,7254.0.htmlhttp://www.fanfiction.net/s/5914668/1/They_Sayhttp://www.fanfiction.net/s/6263455/1/Ascension_Roadhttp://www.fanfiction.net/s/6299894/1/StormfrontA (presumably ongoing) series.
http://www.fanfiction.net/s/6263473/1/Grand_Theft_Agrohttp://www.classicbattletech.com/forums/index.php/topic,5285.0.htmlDark Age stories.
Fatherly Advice
http://www.classicbattletech.com/forumarchive/index.php/topic,21748.64.htmlA fic about a mercenary mechwarrior written in the first person perspective. As a result it's very personal.
Not Meant To Be Here
http://www.classicbattletech.com/forumarchive/index.php/topic,44540.0.htmlBilled as the first Strategic Operations compliant fanfic, Not Meant to be Here is the story of a battle between a Lola III and a Davion II Destroyer. A must read if your thinking of writing about Battletech navel combat
Clarion Call
http://www.classicbattletech.com/forumarchive/index.php/topic,45575.0.htmlInstead of dying when he has a stroke, Hanse Davion wakes up in a hospital with the events of the future all the way up through the beginning of the Word of Blake Jihad shoved into his head.
The Misadventures of Darius Davion, by Tokage
(Thanks Tokage, for re-posting it on the new board)
Dashing, Daring Darius Davion, Cousin of Hanse Davion, is the toast of the Federated Suns. He's been everywhere, done everything.
He's also a coward, a regicide, a murderer, and the biggest fraud in the Inner Sphere.
In the finest traditions of Blackadder.
1: Darius and the Hound
http://www.classicbattletech.com/forums/index.php/topic,770.0.html2: Darius at the Coronation
http://www.classicbattletech.com/forums/index.php/topic,1452.0.html3: Darius and the Heartbreaker
http://www.classicbattletech.com/forums/index.php/topic,1707.0.htmlDarius and the Happy Occasion (I think this is #4 in the series, but I'm not sure)
http://www.classicbattletech.com/forums/index.php/topic,698.0.htmlThe Other Option: Kapetyn's First Strike, by Blacknova
http://ourbattletech.com/kapteyn/kapteyn-universe-downloadsInterview with a Mercenary, by Davout73
A series of interviews, centering around a mercenary unit during the 3025 era
http://www.classicbattletech.com/forums/index.php/topic,319.0.htmlCrossovers:
Daria:
Daria 3059 (A note; you don't HAVE to be familiar with Daria, though it helps. The site does go down for maintenance once a day.)
http://www.thepaperpusher.net/forum/viewtopic.php?f=6&t=7191&start=0Ranma ½
The Saotome Gambit
http://www.fanfiction.net/s/3209934/1/The_Saotome_Gambithttp://vffa.ficfan.org/ (scroll down, it's zipped)
Old Battlestar Galactica
Mission of Civilization
http://bbs.stardestroyer.net/viewtopic.php?f=9&t=146005New Battlestar Galactica
Reunions Are Hell
part 1-
http://forums.spacebattles.com/showthread.php?t=141951part 2-
http://forums.spacebattles.com/showthread.php?t=142885New Battlestar Galactica
Hunted Tribes
http://www.fanfiction.net/s/4083103/1/Hunted_TribesNew Battlestar Galactica
...but somehow a most melancholy
http://www.fanfiction.net/s/5404879/1/But_somehow_a_most_melancholyNew Battlestar Galactica/Ryanverse
Meeting Engagement
http://forums.spacebattles.com/showthread.php?t=150946New Battlestar Galactica
Fifth Column
http://www.fanfiction.net/s/4155819/1/Fifth_ColumnSpinoff- Tales of the Outer Sphere
http://www.fanfiction.net/s/4227763/1/Tales_of_the_Outer_SphereNew Battlestar Galactica
Battlestars and Battlemechs
http://www.fanfiction.net/s/4177889/1/Battlestars_and_Battlemechshttp://forums.spacebattles.com/showthread.php?t=130721New Battlestar Galactica
Lucky 13th
http://forums.spacebattles.com/showthread.php?t=144395http://forums.spacebattles.com/showthread.php?t=153573New Battlestar Galactica/Ryan-verse
Meeting Engagement
http://forums.spacebattles.com/showthread.php?t=150946Buffy the Vampire Slayer
Buffy the Jaguar Slayer
http://www.chignaguet.com/bt_fanfiction/page-59.htmlGundam Seed/Magic Knight Rayearth/Final Fantasy 6/Gundam Wing
Archangel's Amazing Adventures
During the events of Gundam Seed, the Archangel is thrown into another dimension- along with the 4 ZAFT Gundam pilots who keep trying to destroy it. They find themselves stuck with oneanother, as the Archangel travels from dimension to dimension. Chapters 9-16 take place in the Battletech universe, during the Clan Invasion, and subsequent chapters make great use of salvaged mechs from the battletech universe.
http://www.fanfiction.net/s/3729961/1/Archangels_Amazing_Adventures(Note: The author, for all his various weaknesses, is very good about letting his battles be decided by simulating the battles on tabletop, and sticking to the roll of the dice.)
Gundam Seed (And various influences from most other Gundam continualities, and the odd bit of Sailor Moon)
Multimage Empire series
In a distant future of the Battletech universe, where magic exists (though is very, very rare), the Multimage Empire has learned how to travel between dimensions, absorbing people and technology from many incarnations of earth- especially the Gundam ones. Now, a fleet misjumps, through time and space, finding itself stranded in the Cosmic Era of Gundam Seed.
(Note: Uses battletech rules for battles, equipment, Clan culture, but does not take place in the Inner Sphere.)
Legend of the Jokers Wild: The Mojlner is stranded in the Cosmic Era. Takes place during the end of Gundam Seed, through the years afterwards, working up to the end of Gundam Seed Destiny (though this revision hasn't got that far yet)
http://www.fanfiction.net/s/4513907/1/Legend_Of_The_Jokers_Wild_Revised (Revised version)
http://www.fanfiction.net/s/3435806/1/Flight_of_the_Jokers_Wild (Outdated version)
Sidestory: Those Whom Chance Plays With: The three extended pilots, Shani, Oruga and Clotho, have been taken as Bondsmen by Mendel, and have been weaned of their drug dependency.
http://www.fanfiction.net/s/5102090/1/Those_Whom_Chance_Plays_WithSidestory: The Dilemma of Flay Allistar: Flay defects from Blue Cosmos, and joins the Mendel Navy, serving on board the captured warship Domonion
http://www.fanfiction.net/s/3785789/1/The_Dilemma_of_Flay_Allster (Origional)
http://www.fanfiction.net/s/6480514/1/The_Dilemma_of_Flay_Allster_Revised (Revised)
Sidestory: The Inferno that is Chicago: The Mendel campaign to take, and hold, Chicago
http://www.fanfiction.net/s/3805717/1/The_Inferno_That_is_ChicagoThe MultiMage Chronicles
The founding of the MultiMage Empire. The author insists events will eventually catch up to the Inner Sphere eventually.
http://www.fanfiction.net/s/5326452/1/Multimage_Chronicles_The_Legend_of_The_FoundingMass Effect
Exodus of the Stars, by Keiran Halcyon
http://forums.spacebattles.com/showthread.php?t=188615Kerensky's Exodus fleet runs into another fleet- the Quarian Migrant Fleet.
My Little Pony: Friendship Is Magic
The Thessalonica Legacy, by Dashukta
http://www.equestriadaily.com/2011/07/story-thessalonica-legacy.html(Note: All chapters are on Google Docs. )
(Note: Yes, I'm not joking, someone actually wrote a My Little Pony/Battletech crossover. It's not bad either, the author has a good knowledge of both series, and can write well.)
Clancy-verse
Round Robin Thread, by several people
http://forums.spacebattles.com/showthread.php?t=150127Modern Clancy-verse Earth (which is almost identical to ours) is transported into the 3020's Periphery, near the Outworlds Alliance.