Please add support FNEI https://mods.factorio.com/mod/FNEI

Thanks for the suggestion! I'm currently adding a number of other mods. Here are those that should be fairly easy and that I'm doing next:
actual-craft-times-remade
BeastFinder
blueprint-request
bobclasses
bobinserters
boblogistics
CleanMap
Death_Counter
DeleteEmptyChunks
even-distribution
ingteb
Krastorio2
OutpostPlanner
production-potential
quickbarimportexport
rocket-silo-stats
RPGsystem
SchallEntityInspector
SchallSatelliteController

FNEI and other mods that make buttons outside the main top left box are a bit trickier but I'll try that after !

Any ETA for the next update? :) Hopefully, you manage all GUI mess that mods do and can't unify :P
really looking forward (and +1 for FNEI)

I just released 1.4 with 9 new mods supported !
If you've got more suggestions, send them my way!

Auto Trash (https://mods.factorio.com/mod/AutoTrash)
Change Map Settings (https://mods.factorio.com/mod/ChangeMapSettings) (I would be cautious with this one as I'm personally quite used to a wide text button)
Perhaps "Clock" (https://mods.factorio.com/mod/clock) - I mean, yeah I know it's kinda something else, yet it's called GUI Unifier so it would be nice the mod would manage all visible GUI on the main screen to make it look unified and good :)
FNEI as was already mentioned

Research progress Frame (https://mods.factorio.com/mod/research-progress) - this one is bothering me so much because it interferes with other mod(s) and randomly shifting its position on the left side (It is similar to FNEI it's on the left sidebar). Would reaaally appreciate managing this mod.

Thanks ! Some of them are in my todo list. I've just finished downloading about 700 mods to search for GUI stuff in their code. So I have a bit of work ahead!

For info, here are the mods where I found some code about the top left gui (but don't yet know if they're all using it):

attach-notes
AttilaZoomMod
AutoTrash
Avatars
BetterBotsFixed
BlackMarket2
BlueprintAlignment
BlueprintTools
ChangeMapSettings
dana
DeleteAdjacentChunk
DoingThingsByHand
EditorExtensions
Electronic_Locomotives
FacAutoScreenshot
HelicopterRevival
Factorissimo2
KillLostBots
kraskaska-total-raw-resources-calc
Kux-CraftingTools
Kux-OrbitalIonCannon
LandfillEverythingButTrains
LandfillEverythingU
markers
modmashsplinterboom
modmashsplinternewworlds
NewGamePlus
Not_Enough_Todo
nullius
omnimatter_compression
osha_hot_swap
PickerInventoryTools
PicksRocketStats
Powered_Entities
ReloadModsRedux
research-counter
Rich_Text_Helper
RitnTeleportation
SchallEndgameEvolution
solar-calc
SolarRatio
SpaceMod
TheFatController
TogglePeacefulMode
train-log
train-pubsub
upgrade-planner-next
whats-missing

Auto Trash and Change Map Settings DONE

Cool :)

Unfortunately, I'm having a lot of difficulties trying to move FNEI in normal buttons. That mod's code is very obfuscated and I'm not sure I can access the needed functions from my mod

The mod causes a game crash in the latest version when you exit a factorissimo building. Something about teleportation.

Thanks, It's fixed in 1.11.10 !