MBINCompiler 
A tool for decompiling No Man's Sky MBIN files to XML format, and recompiling them back from XML to MBIN.
MBIN reading seems to be working well, structures just have to be created for all the different templates used by the game.
MBIN compiling also seems to be working well, but hasn't been tested very much yet (bug reports are welcomed!)
Note that the format of XML files created by this tool could change at any time.
Builds can be downloaded from our AppVeyor page: https://ci.appveyor.com/project/emoose/mbincompiler/build/artifacts
If you use MBINCompiler to make a mod a mention of us would be appreciated, while not required it'd help a lot to get more exposure.
Also please don't redistribute compiled exes outside of the AppVeyor page, MBINC is changing very rapidly and having outdated builds hosted off-site would be detrimental.
If you want to link to us please link directly to this GitHub page. Once I've felt that MBINC has reached a decent level of usability it'll be released properly on all the usual mod sites.
Requests & Issues
If you have any problems with the compiler feel free to write a bug report in the issue tracker.
Likewise, if you have any requests (eg. a request for a certain MBIN file to be supported) feel free to add your request to the issue tracker too.
Contributions
Contributions would be a great help for this tool, there are hundreds of different templates in No Man's Sky and mapping them all out will take a long time, but with contributions from the modding community this effort can be sped up a great deal.
If you'd like to contribute and have reverse-engineering experience, I've written a guide for finding templates in the game EXE here.
Templates aren't the only contributions accepted though, if you have any improvements to make to the source code they'd be greatly appreciated, while I like to pretend that I'm a decent C# programmer there are loads of people who have a better grasp of the language than I, if any of you can help to improve the code in any way I'd be very grateful.
If you want to talk about development feel free to join the NMS modding discord, MBINCompiler discussion usually takes place in the #mod-mbin channel: https://discordapp.com/invite/3Ytkxss (should work in browsers too, no client downloads needed)
Examples
SCENES\SCREENSHOTS\E32015\MAINSETTINGS.MBIN:
<?xml version="1.0" encoding="utf-8"?>
<Data template="GcSceneSettings">
<Property name="NextSettingFile" value="" />
<Property name="SceneFile" value="SCENES/DEMOS/E32015/MAINSETTINGS/SCENES/SPACE.SCENE.MBIN" />
<Property name="PlanetSceneFiles">
<Data template="NMSString0x80">
<Property name="Value" value="SCENES/DEMOS/E32015/MAINSETTINGS/SCENES/PLANET0.SCENE.MBIN" />
</Data>
<Data template="NMSString0x80">
<Property name="Value" value="SCENES/DEMOS/E32015/MAINSETTINGS/SCENES/PLANET1.SCENE.MBIN" />
</Data>
</Property>
<Property name="SolarSystemFile" value="SCENES/DEMOS/E32015/MAINSETTINGS/SOLARSYSTEMS/SOLARSYSTEM.MBIN" />
<Property name="PlanetFiles1" value="SCENES/DEMOS/E32015/MAINSETTINGS/PLANETS/SUGAS.MBIN" />
<Property name="PlanetFiles2" value="SCENES/DEMOS/E32015/MAINSETTINGS/PLANETS/OBEK.MBIN" />
<Property name="PlanetFiles3" value="SCENES/DEMOS/E32015/MAINSETTINGS/PLANETS/ARMCHAIR.MBIN" />
<Property name="PlanetFiles4" value="SCENES/DEMOS/E32015/MAINSETTINGS/PLANETS/METYUK.MBIN" />
<Property name="PlanetFiles5" value="" />
<Property name="ShipPreloadFiles" />
<Property name="SpawnShip" value="False" />
<Property name="SpawnInsideShip" value="False" />
<Data name="PlayerState" template="GcPlayerSpawnStateData">
<Data name="PlayerPositionInSystem" template="Vector4f">
<Property name="x" value="0" />
<Property name="y" value="0" />
<Property name="z" value="0" />
<Property name="t" value="0" />
</Data>
<Data name="PlayerTransformAt" template="Vector4f">
<Property name="x" value="0" />
<Property name="y" value="0" />
<Property name="z" value="1" />
<Property name="t" value="1" />
</Data>
<Data name="ShipPositionInSystem" template="Vector4f">
<Property name="x" value="0" />
<Property name="y" value="0" />
<Property name="z" value="0" />
<Property name="t" value="0" />
</Data>
<Data name="ShipTransformAt" template="Vector4f">
<Property name="x" value="0" />
<Property name="y" value="0" />
<Property name="z" value="1" />
<Property name="t" value="1" />
</Data>
<Property name="LastKnownPlayerState" value="OnStation" />
</Data>
<Property name="Events" />
<Property name="PostWarpEvents" />
<Property name="SpawnerOptionId" value="" />
</Data>