Recently, I did a large study on "educational computer" Famiclones. As part of this research, I ripped many ROMs from various educational computer systems and cartridges.

Many years ago, I attempted to rip some of the educational computer games as standalone ROMs; though I dubbed almost all of them "bad roms", as they would display glitchy graphics in every emulator. As it turns out, however, I simply...didn't understand how the coding of the games worked. On almost every educational computer device, the internal programs read all graphic data off of the PRG rather than using an additional CHR chip. In my older extracts, I had unknowingly copied decoded graphic data to the games as separate CHR data, which FCEUX places as additional (often incomplete) code in its hex editor. With this in mind, I was now able to extract the ROMs without issue.

It is still rather obtuse to run some of these via single-rom extracts, given the multitude of different inputs required between programs. Most games use a Subor keyboard and either a "3x8-bit mouse" or a "24-bit mouse". Fully 24-bit mouse-based games also work with standard NES controllers, but often have an issue where the cursor will dart to the top-left corner of the screen; I'm unsure what causes this, though it's an issue with the educational bootlegs in general rather than these extracts. Additionally, many ROMs have a second program (or more) built into them; in some cases I was able to separate both games from the file, while in others I could not. Some games also had to be physically decoded to run as separate extracts.

There are around 175 ROMs here total, including variations. These are mostly English and Spanish-language programs, with a handful of Russian ones; Chinese programs are much more difficult to rip (mainly as they use ~224k of data just for the font), though I did rip a few for testing. As a side note, I retained all documentation for this process, but I didn't include it here (as it's kind of a giant mess...); I can provide it if that's something people want.

I have a massive folder of NROM and MMC3 conversions (that's mappers 0 and 4 in iNES header-speak), which are generally bootleg in origin. I'm not sure how much interest people have in mapper conversions these days (I mainly use them for the purposes of rom hacking), though I may as well publish them here. The folders are as follows:

*MMC3 conversions - CoolX-Lite: a set of very elaborate conversions, designed for a customizable multicart developed in Ukraine. while most are pure MMC3, some are based on the "CoolX" mapper itself, which i don't think exists in the iNES 2.0 database yet. there was a giant github page for these which seems to have been taken down, so this moreso serves as a mirror for them. about 100 games in here.
*MMC3 conversions - multicart rips: conversions which i've ripped from various multicarts and plug & plays; many of these are CNROM (or CNROM-like) games. quality control greatly varies with these, some work perfectly while others do not (for example, buggy popper crashes at level 4). 113 games here.
*NROM conversions - misc: anything NROM-based. a few of these are likely available elsewhere, though they can be difficult to find. some of these (including everything in the "plug & play" folder) are my own conversions, with some being created as a "basis" for my previous rom hacks. around 50 games here.

I skipped the other directories I have, as those files can generally be found elsewhere (GoodNES, romhacking.net, clusterrr's website, etc).

I did a code analysis of the aforementioned 5-in-1 cartridge; there are some unused code bits (a copy of "Bicycle Race" and a 6-in-1 menu), but nothing that noteworthy.

Somewhat interesting, though, is that the game "Brave Boy" is a crappy title hack of Nice Code's Twin Cards; specifically the original release with Pikachu intact. As far as I know, the Pikachu version was undumped, outside of another title hack called "Ilk Cards". As the CHR is basically untouched, I was able to recreate a proper Twin Cards ROM using the PRG of the Power Joy version (which replaced Pikachu with a plane).

Among numerous other consoles, an "88-in-1 Joystick" Famiclone was recently added to MAME. This system is effectively a variant of the common "Arcade Action II" 101-in-1 that has been circulating online for years, with the removal of a few games in exchange for a bunch of Cube Technology VT02 hacks (which are quite uncommon compared to the Inventor hack library).

For whatever reason, there are two unused - and as far as I know, undocumented - games in its code: Bon Bon and Air-Launch, hacks of Devil World and Raid on Bungeling Bay, respectively. There may be some other unused games in it as well, though these two stuck out to me given I had never seen them before. Downloads of the two games (alongside an iNES-headered copy of the 88-in-1) are attached below. There is also a 5-in-1 cartridge for this console, though I do not have a copy of the ROM for it currently.

The ROM is heavily encrypted for whatever reason; it's effectively a combination between how the NX-85 and the Pac-Man Pocket Player are coded, both of which had unique forms of protection. Here is a decoded copy, created using the EEPROM Pin Swapper (swapping bytes D0 and D1) and the byte-swapping Python code used for the Pocket Player. I haven't tested it fully yet but it seems to work fine.

I can confidently say in my research that the ports were Nice Code-developed, though that isn't easy to prove in short terms. Some examples off the top of my head:

*Numerous NOAC ports of Atari 2600 games (including Activision/Imagic titles) exist as Nice Code-hacked versions, but were never officially released on any licensed plug & play. This includes Street Racer ("Lightning"), No Escape ("Ice Ocean"), Pressure Cooker ("Candy Workshop"), and quite a few others.
*Nice Code released hacked up versions of unreleased "revisions" of the Intellivision ports. For example, the Snafu hack "Shrew Mouse" has three players, while the official INTV plug & play only shows two. It would be incredibly difficult for such features to be hacked in if Nice Code didn't, at the very least, hold the original source code.
*Other verifiable Nice Code games are known to be included on Techno Source consoles, meaning Techno Source presumably commissioned Nice Code to make the Intellivison titles. Nice Code may have also been hired by Techno Source to produce the Activision/Imagic titles; however, Techno Source's eventual p&p under this license used emulation.
*Some of Nice Code's generic hacked versions are dated 2003/2004, meaning they would have had access to the games at effectively the same time the "licensed" consoles released. As such, it's not like they got ahold of the source code after the fact or something; the generic hacks were produced alongside the official versions.

Additionally, you seem to be confusing two entirely different plug & plays mentioned here. The Missile Command NOAC port is on a different 10-in-1 plug & play; it was released by Basic Fun in 2017 (see https://www.youtube.com/watch?v=zIYnHzGgpig). The Techno Source Activision console, while also not NOAC-based, was released in 2005 (see https://www.youtube.com/watch?v=zSZLbjOBojc). The Jakks Pacific versions are presumably Winbond-based.

There's a quite interesting game on the "8-in-1 (GD-8XX)"... "Math × ÷" is a Chinese translated, mapper 0 conversion of Sansuu 3 Nen, which is normally a mapper 185 game. This may be useful as a basis for further mapper 0 conversions, I attached a rip of the game below.

Edit: it ended up being quite easy to convert Sansuu 1 Nen to mapper 0 based on this code (as well as the Japanese language 3 Nen), so I have attached those converted as well. I was unable to convert 2 Nen, however.