With the advent of multiple new standards for classic Doom format mapping, it is becoming increasingly difficult to find a comprehensive resource that covers this information quickly. The intent with this thread is to pull information for the new standards together and make players aware of these cool new features, modders to get an idea of what is available to them, and source port authors to test these additions to their engines.   If you have a resource or release that is not listed below, please post and I will attempt to add it timely.     DEHEXTRA What Is It? DEHEXTRA is an extension for DeHackEd patches. It is not considered a new lump, but an extension to the existing DeHackEd framework. It provides a significant increase in the number of things and sprites that can be utilized, in addition to the inclusion of 2,910 new states or codepointers. New states can be used to: add new map object types add new non-replacing monsters add new non-replacing decorations add additional frames to existing actors for smoother animations   Knowledgebase DoomWiki Article Doom Retro DEHEXTRA Spec Sheet Doomworld DEHEXTRA Thread ZDoom Wiki Article   Releases Using the Feature Black Ops (Smooth Weapon Mod) - Conversion of "PerK's Smoother Weapon Animations Enhanced (Black Gloves Edition)", by VGA.  Experimental Mixed Bag Salad - 5-Map pack featuring extended dehacked features, by Redead-ITA. Pact of the Damned - 4-Map pack featuring new monsters and a modified arsenal. By Blue Phoenix. SMOOTHED (Smooth Monster Mod) - Conversion of "Gifty's Smooth Doom ZDoom", by VGA.   Tools DECOHack - Part of DoomTools editing suite. Uses a DECORATE-like language scheme for creating DeHackEd patches. By MTrop. WhackEd4 - Can read/modify any Doom Dehacked patches for versions 1.9 and up. Supports modern feature sets, including DEHEXTRA. By Exl.   DSDehacked What Is It? Specification and standard aimed at removing several limitations as imposed by DeHackEd. It is an extension to the MBF21 specification regarding raising the limits of things, states, sprites and sounds in DeHackEd, but it can also be supported separately.   Knowledgebase DoomWiki Article DSDHacked Spec Sheet   Releases Using the Feature   Tools DECOHack - Part of DoomTools editing suite. Uses a DECORATE-like language scheme for creating DeHackEd patches. By MTrop.   MBF21 What Is It? MBF21 is a modern spec built on top of additions made to the Boom and MBF line of source ports. It introduces a range of new features that seek to improve the capabilities available in levels and mods.    Some of the key new features include, but are not limited to: New actor flags, exposing a whole ton of previously-hardcoded actor behaviors (e.g. splash damage immunity and boss death triggers), plus a few new things like ripper projectiles and low gravity Weapon flags, make your weapons silent, customize autoswitch-on-pickup behavior, etc. A lot of new DeHackEd codepointers, with up to 8 customizable args. This allows mods to feature custom weapons and monsters easily Granular control over monster infighting and projectile/splash damage susceptibility (e.g. you can make barons and knights infight, or make imps immune to cacodemons and barrels, and all sorts of funky combinations) A proper "ammo per shot" field for all weapons, not just the BFG Improvements and additions to sector and linedef specials Extension of MBF's OPTIONS lump. Allows wad authors to set a series of variables that affect engine behavior.   Knowledgebase DoomWiki Article MBF21 Information Page - Includes specifications for both editors and source port authors Doomworld MBF21 Thread   Releases Using the Feature Ad Mortem - 18-Map Halloween themed pack featuring new enemies and weaponry. By 4chan's /vr/ board. Axolotl - 11-Map Pack. Cool blue and purple palette. By Xyzzy01. Elysium's Curse: Episode 1 - Cool 6-map pack utilizing MBF21 features. Maps are generally short, tough and fast-paced. Fun With Platforming - 3-Map Pack demoing some of MBF21's features. Focuses on "aerial experiences". By Kraflab. Heretic Invades Doom - 2-Map pack bringing Heretic monsters and weaponry into doom. By Harpax. Herschel Spaceport - Single map with new weaponry and custom monsters. By Moustachio. Judgment - 33-Map megawad. Modifies existing monsters and adds new ones as well. By Rayziik. Lunar Laceration - 9-Map episode on the moon! Features 5 new enemies and modified weaponry. By finnks13. NoReason's Speedmaps 3 - 33-Map pack! By NoReason. Temporal Tantrum - 19-Map pack with 6 episodes and new monsters. By Brxyz, EnragedEggplant, Lunch Lunch and WashingMachineEnthusiasts. Zzul Bases - 4-Map pack    Tools DECOHack - Part of DoomTools editing suite. Uses a DECORATE-like language scheme for creating DeHackEd patches. By MTrop.   UMAPINFO What Is It? UMAPINFO is a cross-port standard, designed to allow engines to read a lump containing meta-data associated to levels (such as their name, music, sky texture, par time, etc.).   Knowledgebase DoomWiki Article UMAPINFO Specification - via PRBoom+ Github.   Releases Using the Feature Fork in the Road - "10-Map" pack made to experiment with the added flexibility provided by UMAPINFO. Each map has multiple exits leading down different paths. Dead But Dreaming - 12-Map pack in a occult setting. By Doomer Boards Krew Pact of the Damned - 4-Map pack featuring new monsters and a modified arsenal. By Blue Phoenix.   Tools UMAPINFO Designer - By JadingTsunami.