Blind Fighting is one of the more "different" from 5e. You become immune to magical darkness, much like the Devil's Sight invocation. Unlike in 5e, it does not allow you to see invisible creatures.

Superior Technique grants you one Superiority Dice and access to the Riposte Maneuver from the Battle Master subclass. This dice stacks with others you might have, and also refreshes on a Short Rest.

Blessed Warrior grants you the Guidance and Sacred Flame cantrips from the cleric spell list. Charisma is your spellcasting modifier for them.

Druidic Warrior grants you the Shillelagh and Thorn Whip cantrips from the druid spell list. Wisdom is your spellcasting modifier for them.

Unarmed Fighting changes your unarmed damage to 1d8 + Your Strength Modifier, making your fists as strong as any hammer. Go wild!
Note that your fists still won't count as "weapons" so any features or spells (looking at you, paladin) that require a weapon won't work.

Mariner improves your mobility as long as you aren't wearing heavy armor or using a shield. Your movement speed increases by 3 meters, your jump distance increases by 50%, and your AC increases by 1.

Tunnel Fighter helps you hold a position in the face of multiple enemies. As a bonus action, enter a defensive stance until your next turn that grants you an additional reaction and increases your AC by 1.

Thrown Weapon Fighting increases your damage done with thrown weapons (when they're actually thrown, mind you) by 2.

Plans
Some custom fighting styles too! It depends on what I come up with and whether I decide it's balanced enough to add to the game.

Fixes and/or improvements as I gain more modding experience, hopefully.

Compatibility
While I don't have a full list of mods this is and isn't compatible with, there are a few things of note for this mod. This mod expands the vanilla list of fighting styles available to the paladin, fighter, and ranger. It does not edit the class progression of any of those - whenever you'd pick a fighting style on them, you'll simply have more options. With that said, these two types of mods could be incompatible:

• Any other mods that edit the vanilla lists of fighting styles for fighter, ranger, or paladin.
• Mods that edit the class progression for fighter, ranger, or paladin. If those mods pull from vanilla fighting styles, then this will work just fine alongside them. Otherwise, incompatible.
  

As I come across mods that are incompatible, I'll try to note which mods they are so you know for sure.
Unlocked Fighting Styles
If you want all the fighting styles all the time, this mod is for you. All fighting styles from the base game and from Additional Fighting Styles will be available to Fighters, Paladins, and Rangers. Find this under the Miscellaneous files on the downloads page.

Sometimes I'll update one but not the other. Don't worry - I'll get there eventually.

Unlocked Fighting Styles is currently version 1.3.0 and includes ten fighting styles from AFS.

This mod replaces Additional Fighting Styles. Don't use both. The manual installation is identical - the ID and internal name of Unlocked is the same as Additional.

Manual Installation
If, for some reason, you want to install the mod manually, head on over to your mod settings (located in AppData/Local/Larian Studios/Baldur's Gate 3/PlayerProfiles) and paste in the following:
<node id="ModuleShortDesc">
<attribute id="Folder" type="LSString" value="AdditionalFightingStyles"/>
<attribute id="MD5" type="LSString" value=""/>
<attribute id="Name" type="LSString" value="AdditionalFightingStyles"/>
<attribute id="UUID" type="FixedString" value="6ed1f4e3-c53a-4b66-bbfe-03620e8c956b"/>
<attribute id="Version64" type="int64" value="1"/>
</node>

Assuming you have no other mods, your file should look something like this:
<?xml version="1.0" encoding="UTF-8"?>
<save>
    <version major="4" minor="0" revision="9" build="331"/>
    <region id="ModuleSettings">
        <node id="root">
            <children>
                <node id="ModOrder"/>
                <node id="Mods">
                    <children>
                        <node id="ModuleShortDesc">
                            <attribute id="Folder" type="LSString" value="GustavDev"/>
                            <attribute id="MD5" type="LSString" value=""/>
                            <attribute id="Name" type="LSString" value="GustavDev"/>
                            <attribute id="UUID" type="FixedString" value="28ac9ce2-2aba-8cda-b3b5-6e922f71b6b8"/>
                            <attribute id="Version64" type="int64" value="36028797018963968"/>
                        </node>
                        <node id="ModuleShortDesc">
                            <attribute id="Folder" type="LSString" value="AdditionalFightingStyles"/>
                            <attribute id="MD5" type="LSString" value=""/>
                            <attribute id="Name" type="LSString" value="AdditionalFightingStyles"/>
                            <attribute id="UUID" type="FixedString" value="6ed1f4e3-c53a-4b66-bbfe-03620e8c956b"/>
                            <attribute id="Version64" type="int64" value="1"/>
                        </node>
                    </children>
                </node>
            </children>
        </node>
    </region>
</save>

Final Notes
If you got this far, congratulations! This is my first-ever mod and I'm still learning a lot about modding Baldur's Gate 3 (I only bought it a week before launch, after all) but I am hopeful that I can continue to develop this and maybe some other little projects too. Who knows, maybe someday I might actually be good at it!