ZDoom 2.7.1 is now available from the download page. This version includes the following changes from 2.7.0:

• Added new additive GameInfo keywords: AddCreditPage, AddPlayerClasses, and AddInfoPage.
• Added a new DONTDRAIN flag to mark actors as ineligible for vampirism attacks.
• Compatibility fixes for Ultimate Simplicity map07, Cheogsh map01, Super Sonic Doom map31
• Polyobject mirror numbers can no longer be changed with SetLineSpecial. This was never a supported feature and caused problems for legitimate uses of SetLineSpecial on polyobject lines.
• The powered-up Gold Wand was not puffing on actors.
• Disabled Heretic's punishment cheats when in allcheats mode.
• Objects that explode on death no longer deal the damage they were dealt instead of their own.
• Vampirism attacks now respect damage reduction.
• Demo recording now writes correct user info to demos.
• ACS's PlaySound for looping sounds now works properly when using channel flags.

For those interested in ZDoom's development, the source code repository has migrated to GitHub: http://github.com/rheit/zdoom

To use the new ACS features of ZDoom 2.7, ACC 1.54 is also available now.

It's been almost a year since the last release, so here's ZDoom 2.7.0. In addition to various bug fixes, here are some highlights of the new features:

• Added support for Doom 3: BFG Edition's modified IWADs, including No Rest for the Living.
• ACS:
  • Made dynamic strings persistent. ACS can now safely generate up to one million new strings.
  • Added new functions: Sqrt, FixedSqrt, VectorLength, CheckFont, GetCVarString, GetUserCVar, GetUserCVarString, IsTIDUsed, LineAttack, SetCVar, SetCVarString, SetUserCVar, SetUserCVarString, SpawnDecal, and UniqueTID.
  • Added HUD layers, visibility flags, additive blending, and alpha parameter to HudMessage and HudMessageBold.
  • Also added HUD message wrapping and clipping with SetHudClipRect and SetHudWrapWidth.
  • Added acsprofile console command.
  • Added PLAYERINFO_FOV and _DESIREDFOV to GetPlayerInfo.
  • Added support for desaturated translations.
  • Added the ability to retrieve the ReactionTime, Height and Radius properties through GetActorProperty.
  • Added CHANGELEVEL_PRERAISEWEAPON to ChangeLevel.
• DECORATE:
  • FLOATBOB things are no longer moved physically when bobbing.
  • Added Player.FallingScreemSpeed, Player.GruntSpeed, MinSelectionAmmo1, and Weapon.MinSelectionAmmo2.
  • Added random state duration and A_SetTics.
  • A_Explode's ''affectsource'' parameter has been turned into a flag. Plus, added NOTMISSILE flag to A_Explode as well as to A_RadiusThrust.
  • A_RadiusThrust can use negative ''force'' values.
  • Added A_JumpIfTargetInsideMeleeRange, A_JumpIfTargetOutsideMeleeRange, A_SetDamageType, and A_CheckLOF.
  • Added INVENTORY.NEVERRESPAWN, INVENTORY.NOSCREENFLASH, POWERSPEED.NOTRAIL, and PLAYERPAWN.CROUCHABLEMORPH.
  • Added JLOSF_NOAUTOAIM flag to A_JumpIfTargetInLOS.
  • Added WRF_DISABLESWITCH to A_WeaponReady.
  • A_Light can use negative values to darken the scene.
  • Added NORANDOMPUFFZ flag to A_CustomPunch, A_FireBullets, and A_CustomBulletAttack.
  • Added SXF_USEBLOODCOLOR, SXF_CLEARCALLERTID, SXF_MULTIPLYSPEED, SXF_TRANSFERSCALE, SXF_TRANSFERSPECIAL, and SXF_CLEARCALLERSPECIAL flags to A_SpawnItemEx.
  • Added the ability to adjust the vertical offset of a rail attack to A_RailAttack and A_CustomRailgun.
  • Player-fired seeker missiles' range at which the missiles initially lock-on a tracer can be set via MaxTargetRange actor property.
  • ReactionTime added to DECORATE expressions.
  • Added NoDelay state flag.
  • Added Bounce actor states.
  • Fixed few cases of DECORATE definitions inaccuracies for Doom, Heretic, Hexen and Strife actors.
• Added the ability to define mod-specific console variables through the addition of the CVARINFO lump.
• Added Floor_RaiseAndCrushDoom.
• FONTDEFS: Backported SPACEWIDTH from ECWolf.
• LANGUAGE: Brazilian Portuguese support.
• MAPINFO: Added ForgetState, RememberState, and SpawnWithWeaponRaised flags for map definitions and NoRandomPlayerclass for GameInfo definitions.
• FluidSynth now recognize libfluidsynth.dll as a valid alias for fluidsynth.dll. Some FluidSynth defaults have also been tweaked.
• OPL emulation now includes two new OPL3 emulators, and you can have the equivalent of up to eight chips for one song. In addition, all OPL emulations support full stereo panning (something the real hardware cannot do).
• Updated foo_DUMB.
• Implemented additive rendering for 3D floors.
• Added Quake-like no-clipping with noclip2.
• Exported the scoreboard text to LANGUAGE.
• The sound system should now precache nearly all sounds used by actor properties and ambient sounds, and the MAPINFO command "PrecacheSounds" can be used to precache other sounds.
• Arbitrary FPS cap with vid_maxfps.
• Increased maximum resolution to 5760×3600.
• Added lightfog property for sidedefs.
• Added ability in UDMF to specify things to spawn by thing specials and Hexen breakable items by names with arg1str, as well as the ability to set initial values to a thing's user variables.
• Added new node format for complex UDMF maps which need fractional precision on node splitters.
• The alternate HUD now features a Berserk indicator and a customizable time display.
• Weapon slots can be configured from the Customize controls menu.
• RandomSpawners now respect -nomonsters.

ZDBSP has received a small bug fix and is now at version 1.18.1. This corrects a problem in earlier versions that could potentially create invalid nodes with maps that have more than 65535 lines or with maps that use the new node format introduced in ZDBSP 1.18.

ZDBSP 1.18 is now available. This version introduces a new node format for better compatibility with UDMF maps that have vertices with fractional coordinates.

ACC 1.53 is now available and supports the latest features of ZDoom 2.6, such as scripts with four parameters, waiting on named scripts, and some very minor bug fixes.

In addition, the -h command line option no longer silently promotes non-Hexen features to the ZDoom script format. You now get an error when you try to use ZDoom-features in Hexen-compatible mode.

I would have put this up with ZDoom 2.6.0, but it slipped my mind. Sorry about that.

ZDoom 2.6.1 is now available. This is primarily a bugfix release for 2.6.0, however it contains one breaking change: Voxels are now rotated 90 degrees to match their orientation in Slab6.

There are also a few minor new features:

• DECORATE:
  
  • INVENTORY.RESTRICTABSOLUTELY flag for being extremely restrictive of cross-class item pickup
  • PLAYERPAWN.CANSUPERMORPH flag for morphed player classes that give you a Tome of Power powerup if you an attempt is made to morph you into the same class while you are already morphed into it. (Used by Heretic's chicken)
• MAPINFO:
  
  • RandomPlayerStarts will disable voodoo dolls and instead spawn players at random start spots.
  • UsePlayerStartZ will respect the start spots' Z coordinates and let you spawn players off the floor.
• Hacx 2.0 is now a detectable IWAD.

ZDoom 2.6.0 is now available, almost two years after version 2.5.0 was released. This release is available in the usual Windows version as well as in a Mac OS X version.

There have been hundreds of bugs fixed since then as well as numerous enhancements:

• Added Hacx IWAD support.
• Added text-format Strife conversation system with USDF and ZSDF.
• A textured automap is now available; automap graphics are now externalized.
• Rewritten menu system, which can now be defined with the MENUDEF lump.
• Externalized intermissions to MAPINFO.
• Externalized IWAD detection and gave each IWAD its own independent config section.
• Added FluidSynth and GUS emulator softsynths; fixed issues with TiMidity++.
• Added VOC support and enhanced MIDI playback with support for alternative formats such as XMI and HMI.
• Action specials: Added Ceiling_LowerAndCrushDist and Thing_SetConversation. Added console command to execute specials.
• ACS:
  • Increased maximum script number from 999 to 32767.
  • Named scripts allow to avoid script number conflicts altogether.
  • Added StrCopy, CheckSight, SetActivator, SetPointer functions.
  • Added APROP_ScaleX/Y and APROP_Mass actor properties.
  • Added temporary dynamic strings variables with StrParam.
  • Scripts can now have up to four parameters.
• DECORATE:
  • Added A_CheckFlag, A_FaceMaster, A_FaceTracer, A_RadiusGive, A_SetMass, A_SetScale, A_Warp and A_WolfAttack...
  • Enhanced A_AlertMonsters, A_BFGSpray, A_Blast, A_CustomBulletAttack, A_FireBullets, A_GunFlash, A_PainAttack, A_RadiusThrust...
  • Added an actor pointer manipulation system with several new codepointers...
  • Added DOHARMSPECIES, DONTCORPSE, SEEINVISIBLE and INVENTORY.UNTOSSABLE
  • Increased damage type flexibility in several ways with DeathType and PainType.
  • Added customizable fléchettes.
  • Made accuracy and stamina accessible through DECORATE expressions.
  • Added ProjectileKickback, Inventory.RestrictedTo and Inventory.ForbiddenTo class-based properties.
  • Backported VisibleToTeam, VisibleToPlayerClass and weapon DropItem feature from Skulltag, and enhanced them.
  • Added "Fast" keyword for states and deprecated the unreliable FASTER and FASTMELEE flags.
• Added a secret hint system.
• 3D floors support.
• FraggleScript support.
• Voxel support.
• SBARINFO: Ammo 1/2 capacities added to DrawNumber, support for color names in colored text.
• SNDINFO: Added musicalias and attenuation.
• Compatibility: fixed issues with Eternal Doom, Happy Time Circus, Phobos, vanilla compat, Boom compat, light levels higher than 255, Heretic, Strife, MUSINFO, misnamed UDMF field.
• Fixed loading of BMF palettes.
• restart console command.
• Added PALVERS lump for specifying alternate graphics to use with a paletted render, in case the graphics you really want to use look bad without true color.
• Custom IWADs no longer need to include a COLORMAP, as ZDoom will generate one automatically if it is missing.
• Fixed vertical tiling of non-power-of-two textures.

(Big thanks to Gez for compiling this list of changes.)

ZDBSP 1.17 has been released. This version fixes a critical bug introduced in 1.16 that caused it to write garbage for normal nodes. Upgrading is strongly recommended.

It also has some minor performance improvements.