here i will place just assorted dutch metalcore/deathcore bands to fill the details later (basically copied from metal-archives.com)

Band Genre Status
Band Genre Status
Instil Melodic Death Metal, Metalcore Split-up
Blind Sight Groove Metal/Metalcore with Thrash Metal influences Active
Isle of Man Technical Death Metal/Metalcore Split-up
Pitfall Groove Metal/Metalcore Split-up
Rectify Metalcore Active
Syncardion Melodic Death Metal/Metalcore Active
Stench of Death Black Metal (early); Death Metal/Metalcore (later) Split-up
Uplifted Melodic Metalcore/Hard Rock Split-up
Bloodline Melodic Death/Thrash Metal with Metalcore influences Changed name
Eyepatch Thrash Metal/Crossover/Metalcore Split-up
Intero Metalcore Active
Dark Day Remains Thrash Metal/Metalcore Split-up
Magnacult Death/Groove Metal/Metalcore Active
When All Life Ends Deathcore Split-up
Miscreants Thrash Metal/Metalcore Split-up
Born from Pain Metalcore/Hardcore with Thrash Metal elements Active
Ataglance Thrash Metal/Metalcore Split-up
Vulgar Faction Groove Metal/Metalcore Active
The Darkest Red Melodic Death Metal/Metalcore Split-up
Mindscan Metalcore Active
Coremass Thrash/Groove Metal/Metalcore Split-up
Pharmacon Metalcore Split-up
Samaritan Metalcore Split-up
First Fight Down Metalcore Active
Wasted Bullet Metalcore/Thrash Metal Split-up
Repulse Death Metal/Deathcore Split-up
Severe Outburst Thrash Metal/Metalcore Split-up
Dawn of Mankind Death Metal/Metalcore Split-up
12 Gauge Thrash/Groove Metal/Metalcore Split-up
Last Breath Denied Metalcore Active
ZubZero Thrash Metal/Metalcore Active
Burn the Iris Metalcore/Groove Metal Split-up
Incission Thrash Metal/Metalcore Split-up
Eternal Blackout Thrash Metal/Metalcore Split-up
Soulnerve Melodic Thrash Metal/Metalcore Active
Drain Life Thrash Metal/Metalcore Active
The Architects of Hate Thrash Metal/Crossover/Metalcore Split-up
Kudra Mata Thrash Metal/Metalcore Split-up
Total Infection Thrash Metal/Metalcore Split-up
Face the Fact Death/Thrash Metal/Metalcore Split-up
Divine Sins Melodic Death Metal/Deathcore Split-up
Treatment Metalcore/Melodic Death/Groove Metal Split-up
Defeat Lies Ahead Death Metal/Metalcore Split-up
Eye of Judgement Metalcore Split-up
Out Comes the Storm Thrash Metal/Metalcore Active
Strych.Nine Melodic Death Metal/Metalcore Unknown
Purest of Pain Melodic Death Metal/Metalcore/Deathcore Split-up
When All Light Dies Melodic Death Metal/Metalcore Split-up
Grim Ordeal Thrash Metal/Metalcore Active
All Heads Rise Metalcore Split-up
Neckbreak Nation Progressive Groove Metal/Metalcore Active
Unseen Perception Death Metal/Deathcore Split-up
The Scarlet Claw Death Metal/Deathcore Active
Undawn Melodic Groove Metal, Metalcore Active
State of Negation Thrash Metal/Metalcore Split-up
Selfmachine Metalcore/Groove Metal Active
Meadows Death Metal/Deathcore Active
Gnadab Progressive Death Metal/Deathcore Active
Dying Flame Groove/Thrash Metal/Metalcore Split-up
Serpents Seduction Death Metal/Deathcore Active
For I Am King Melodic Death Metal/Metalcore Active
Faith Ablaze Metalcore Split-up
Mellow Vocals Brutal Deathcore (early); Various (later) Active
Delusional Melodic Death Metal/Metalcore Active
Salute the Exiled Deathcore Active
Axe to Grind Melodic Groove Metal/Metalcore Active
Lies! Metalcore Active
Spitting Nails Metalcore Active
Hellfire Groove Metal/Metalcore Active
Godsfarm Brutal Death Metal/Deathcore Active
My Own Words Crossover/Thrash Metal/Metalcore Active
Ann My Dice Metalcore Active
Bring On the Bloodshed Metalcore Active
Atmoran Melodic Thrash/Death Metal/Metalcore Active
Human Demise Metalcore Split-up
Project Sphacelus Abomination Brutal Death Metal/Deathcore Active
Spyker Metalcore/Thrash Metal Unknown
Emesis Death Metal/Metalcore Active
Subspectral Melodic Death/Progressive Metal/Metalcore Active
Release the River Melodic Black/Death Metal/Metalcore Active
Constructivist Metalcore Active
xArmadylGodswordx Slam/Brutal Deathcore Split-up
Everything Decays Deathcore/Groove Metal Active
Demoralizer Death Metal/Deathcore Active
Drunken Dreams Metalcore Unknown
Faint Solace Metalcore Active
Depraved Will Melodic Deathcore Active
Curselifter Metalcore Active
As Empires Fall Melodic Death Metal/Metalcore Split-up
Stone Cold Metalcore Unknown
Omission Metalcore Split-up
Mindscarred Metalcore Split-up
Black Pegasus Deathcore/Sludge/Post-Metal Active
The Opponent Process Symphonic/Melodic Death Metal/Metalcore Split-up
Loyalty Ends Here Melodic Metalcore Active
Sapphyr Symphonic Deathcore Active
Wormodon Blackened Deathcore Active
Nafearya Metalcore/Groove/Death Metal Active
Tenuem Symphonic/Melodic Metalcore Active
A Devastating Truth Technical Deathcore Split-up
Witness the Fall Metalcore Active
Forgettoforgive Deathcore Split-up
Fate Comes Along Crossover/Metalcore/Hardcore Split-up
Signs of Extinction Blackened Deathcore Active
Godless Monarchy Death Metal/Deathcore Unknown