I thought I'd put together a small compilation of things uploaded to the binary site, both for fans of the series and those interested in editing some of the games, especially seeing as many non-Japanese fans aren't likely to just know about these unless they already overheard about these from others. Sooooooo. Oh, and apply these to untranslated ROMs. Check out NicoNico for videos (nicovideo.jp). Always check the readmes if you're interested more about the hacks than I described.
Here's a number of hacks for Seisen--I'll state if they're for a different game if relative. I'm only really including nifty or "complete" ones, not addendum patches, like enabling new algorithms, RNGs, adjustments of skills, and the like.
FE4 ネールの系譜 Ver3.21
Genealogy of Neir
I think this is a finished hack, but I'm not sure. As it sounds, it follows holy blood Neir characters, starring Lex as the main Lord. Thracia graphics are everywhere: new weapon graphics, some new character animations, a number of new palettes--new enemies, modified skills. Pick it up if you're a fan of Seisen (FE4)--like most of these ^^
Genealogy of Narga
Like the above, but I don't think it's finished. Prince Kurth is the main Lord, and there's new maps to play around in too. Lots of new enemies, I think this one had modified events starting up. Basically the Genealogy hacks are worth playing simply because they're more than simple edits.
Genealogy of Ayra
Ayra's the main Lord. Lots of Odo characters running around--Galzus! There's a complete playthrough on NicoNico through both generations, so I assume this is complete. Always check back at the main site to see if any updates were made--look for newer version releases. Pretty cool from what I played.
A hack of Seima that includes a bunch of ASM modifications, new maps, new classes, a cast of all-female characters from the GBA subseries. And new animations. Sort of like Will of Good and Evil (FEChina as later players have called it, as it was made by Chinese fans), but with less editing and more customness. Beware that this may be a beta, so keep an eye out for future releases.
FE4 トードの系譜～Another～ Ver1.30
Genealogy of Tordo
I think Tiltyu or Tinny is the main Lord. Same as the Genealogy hacks before this. Have fun--I think this one had map music switched around. Maybe it was a different one ._.
FE4 RM2.97用 改造パッチ
Seisen Remodeling Patch
I think this is the one where a bunch of the mugshots were redone in Thracia 776's style. It's likely in progress, and hopefully will include further modifications of graphics as time goes on. If not... well, this described hack is somewhere on their site
FE5 ブルーム v0.9.8c
FE5 Blume (?)
I couldn't get this to work on either the NP or ROM version of Thracia (the base game). I assume it's for Thracia, considering the name... but it could be anything. I don't remember what the readme said :/
Genealogy of Fala
This is canceled as far as I can tell, sadly. Hopefully it may only be on ice for the moment. Either way, check it out--I don't remember how far it goes, but it's as nice a hack as any fan could ask for.
Additional Animations for Seisen (?)
I'm trying to go by memory, and I think this includes a bunch of graphical files I suppose are necessary for multiple-weapon animations across various classes. All can be opened with your graphic-editor of choice. I don't remember if there's a patch or instructions for inserting these graphics... but hey, if you're interested, you'll download.
FE8 Stealing Modification
It sounds like the stealing methods were changed for Seima (FE8). I think it might be related to the FE8 Girls hack. Listed under here for its nifty value, I suppose.
Thracia 776 caps raised to 30.
Like it sounds, raises caps to 30. Thracia is an awfully rushed game, and I think the all 20 was part of it. I'm more interested in seeing FalaFlame and the like restored accurately myself, especially as animation data is still in there... but meh.
FE3 紋章のビラク ver1.12
Monshou hack - Villuck (Biraku)
If memory serves, there's a hack that had replaced Marth with Biraku and made the story centric of him, or something. I'm thinking this is the one, though I couldn't get it to work for me--one version it crashed, the other had no changes. Don't know if either Book matters, but neither did anything for me.
Music modification for Monshou
It's just a test hack that replaces the intro tune with the flute playing from A Link to the Past. If you're interested in editing music for Monshou, a simple file comparison will give you the location of the relevant data without having to locate the data yourself. Though if you're really interested in it, you'll likely not be needing this with what you're wielding.
I've heard good things about this, but I'm not sure what it is really. It's for Seisen. I think it's similar to the Binary hack. Nothing looked changed when I tried it though... Maybe you guys will have better luck. Let me know ^^
"The battle of NPC the map and real are changed, the possible conversion patch"
I think this switches the animations in Seisen for NPCs. Specifically, they attack with battle animations on, rather than reverting to their overworld ones. Though I personally prefer the overworld ones, so I don't know what you're thinking downloading this >.> <.<
マルス様の系譜 2007/03/31 DL
"Marth's Way Genealogy"
Replaces all characters from Seisen (well, important ones anyways, I think) with ones from Monshou, along with relevant adjustments of mugshots, graphics, and classes. Fun, but I'm not sure if it lasts for the entire game, or at least up to the second generation.
Seisen no Keifu Event "Editor"
This will run through your ROM and create a reference list of all events a chapter use. Consult the readme for more information, naturally. What you basically do is run the application (readme) and indicate what map you want, either beginning at '0' or '1.' I'm not sure if it works by hex or decimal addresses. In any case, a log is created defining at which addresses event code is located, along with comments describing each line's function. With some basic ingenuity and patience, you should be able to figure out the events enough to create your own custom ones.
FE4 MAP Editor ver0752
A map editor for Seisen Supports palette modification, tileset switcing, and general editing of level data. Once you've completed your map save the BIN file and compress it with the included encoding program. Then go back to the editor and chose to overwrite the existing map--make sure you always make a back-up incase it crashes the game! There's also a number of other features in it too that I don't understand, some of it looks like event/unit information. I haven't had much of a chance to mess around with it myself.
FE3 Animation Editor もどき ver0.15
Animation editor for Monshou.
Duh. Allows you to edit/create battle animations for Monshou. There may be some decompression tools included, but I don't remember :/
"The FE image compression program ver2.4 of SFC"
It sounded like it helps in inserting custom mugshots for the three SFC games (Monshou, Seisen, and Thracia). Pretty basic, though I couldn't get it to work last I tried.
FE3 MAP Editor ver0.65
I believe it's made by the same guy who did Seisen's. Though this version properly displays enemy locations in maps.
トラキア776 ROM Editor
Data editor for Thracia 776
Edits a bunch of data for Thracia 776, including the basics of enemy and ally data, weapon data, and the like.
http://febin.so.land.to/src/FE0018.zip (an older or separate version?)
FE聖戦 ROM Editor
Seisen ROM Editor
Like the above, but for Seisen. There's also something to do with text included. I think when I first got this years ago on FESS, there was an optional English file that went along with it. Maybe I'll look around for it sometime, or someone who remembers will speak up ^^
烈火の剣 ROM Editor
Rekka no Ken ROM Editor
Take a guess.
封印の剣 ROM Editor
Fuuin no Tsurugi ROM Editor
聖魔の光石 ROM Editor
Seima no Kouseki ROM Editor
Credits to Celice from SF for the OP
Whenever FE Binary uploads a new patch, the delete the old one. Try looking here for the patch you are trying to find. The site is Japanese and so are the hacks but i dont let it bother me. The hacks are really fun, you seriously have to give it a go.
Might wanna pin this, Blazer