Disney Classic Games Collection roms can be extracted with this method:

github.com/farmerbb/RED-Project/wiki/Disney-Classic-Games:-Aladdin-and-The-Lion-King

UPDATED, thank you!
GOG forum can't render the upstream URL correctly, so I use the URL https://github.com/farmerbb/RED-Project/wiki/

A few games from Piko Interactive released today, and 2 of them include emulated versions other than MS-DOS's.
From the store page of each game:

Jim Power - The Lost Dimension: Switchblade:

We need someone to extract those ROMs. :-)

Tried Jim Power - The Lost Dimension and Switchblade and it looks like that the roms are already extracted and working.
There is a file "game" in the subfolder "res", just rename it and give it the correct file extension.

MD version = .gen or .md
SNES version = .sfc
NES version = .nes

i recommend you not to install all editions of Jim Power at the same time with the offline installer, because they all would install in the same directory and overwrite their own files by default.
Of cause you could also correct the installation path in the "Options" dialog and give every game it's own directory

I don't have those games specifically, but usually Mega Drive ROMs use the .bin extension. Do the ROMs from today's releases work with this extension instead of .gen and .md?

ADDED, thank you!

it's a matter of taste. the extensions tells your emulator which system it should emulate.
.bin is a more generic extension but if it works for you than it's ok.

Friendly reminder that multiple games from the list are on sale now.

Based on these two posts I was able to make it work for Windows.

First you need to go to https://github.com/sigboe/extractwings, download the files and extract them all in a folder and copy the "ZAMN_GP.exe" file in that same folder.
Then you need to create a new batch file for Windows. Just open "Notepad" or similar, copy the following lines and save it as "ExtractZAMN&GP-1_1-GoG.bat" in the same folder as the other files:

@ECHO OFF
SET "mypath=%~dp0"
SET "mydir=%mypath:~0,-1%"
cd "%mydir%"
echo Extracting "Zombies Ate My Neighbors (USA).sfc".
".\dd.exe" "if=%mydir%\ZAMN_GP.exe" "of=%mydir%\Zombies Ate My Neighbors (USA).sfc" bs=1 skip=28346700 count=1048576
echo "Zombies Ate My Neighbors (USA).sfc". Extract Complete. The MD5 should be: 23C2AF7897D9384C4791189B68C142EB
echo.
echo Extracting "Ghoul Patrol (USA).sfc".
".\dd.exe" "if=%mydir%\ZAMN_GP.exe" "of=%mydir%\Ghoul Patrol (USA).sfc" bs=1 skip=26867136 count=1048576
echo "Ghoul Patrol (USA).sfc" Extract Complete. The MD5 should be: 657FA94CFF4464CBC58C476EA642299A
echo.
pause

Finally run the new batch file you created and voila!

FULL DISCLOSURE. I personally own the Steam version, not GOG. The offsets provided above were taken from the original posters. If one wanted to create a batch file for the Steam version then the correct commands are:
".\dd.exe" "if=%mydir%\ZAMN_GP.exe" "of=%mydir%\Zombies Ate My Neighbors (USA).sfc" bs=1 skip=28360012 count=1048576
".\dd.exe" "if=%mydir%\ZAMN_GP.exe" "of=%mydir%\Ghoul Patrol (USA).sfc" bs=1 skip=26880448 count=1048576

Piko Interactive released a few likely emulated games through GOG yesterday:
https://www.gog.com/forum/general/check_out_the_new_batch_of_classics_from_piko_interactive_980c3/page1

What they released, from what I was able to gather:
Shadow Madness - PS1 version
Iron Commando - Probably SNES version
Legend - Probably SNES version
Nightshade - Probably NES version
Zero Tolerance - Probably Genesis/Mega Drive version

I don't have those games here, so I'm basing myself on their Steam releases (aside from Shadow Madness, which was confirmed by an user in the news post). If anyone could confirm those games, it'd be much appreciated.

I can confirm these two are indeed the SNES version and come with the ROMs directly extracted and available for use.

Also, Water Margin - The Tale of Clouds and Wind similarly comes with a Sega Genesis ROM.

ADDED, thank you!

Wait for confirmation:

Bought the game, and I can confirm, it is a PS1 game.
The pertinent files are "game.cue" and "SHADOW_MADNESS_MULTI.BIN" in the folder C:\GOG Games\Shadow Madness\res, if you install the game on C:\GOG Games\
Probably "mcd1" and "mcd2" are memory cards used by the packaged emulator, but I didn't test them.

ADDED, thank you!