Some sort of “system program” that features a hex editor, disassembler, port monitor, etc. akin to KnightOS’ features.

https://www.ticalc.org/archives/files/fileinfo/196/19619.html

the pieces of KnightOS are maintained as separate projects under the KnightOS organization

Compatible with the TI-73. The most recent versions may support USB upload from PC, allowing this to effectively completely replace the original calculator OS.

https://knightos.org/

https://github.com/KnightOS/KnightOS (git most recent & USB, but compile difficult)

https://www.ticalc.org/archives/files/fileinfo/463/46387.html (precompiled, NO USB!!)

The only ASM shell for the TI-73 w/ dedicated programs, unless you want to count Swan or KnightOS. Has two versions, 0.2 and 0.3, with 0.3 apparently being just a test.

https://www.ticalc.org/archives/files/fileinfo/366/36618.html (0.2, for TI-OS 1.6)

https://www.ticalc.org/archives/files/fileinfo/388/38805.html (0.3, for all TI-OSes?)

A flash shell that can run Mallard programs. Little information about appearances.

https://www.ticalc.org/archives/files/fileinfo/455/45516.html

What even is this? The TI-81 has no way to communicate with a PC.

https://www.ticalc.org/archives/files/fileinfo/48/4859.html

Various text only shells that are required for many games on this thing. A few are dead, so look in…

https://www.ticalc.org/archives/files/fileinfo/226/22691.html (Ace)

https://www.ticalc.org/archives/files/fileinfo/14/1411.html (Ash)

https://www.ticalc.org/archives/files/fileinfo/286/28681.html (CrASH new for 82s)

https://www.ticalc.org/archives/files/fileinfo/87/8774.html (CrASH update)

https://www.ticalc.org/archives/files/fileinfo/87/8772.html (CrASH)

https://www.ticalc.org/archives/files/fileinfo/16/1628.html (JASS)

https://www.ticalc.org/archives/files/fileinfo/1/113.html (OS-82)

Whatever this is, it has no information.

https://www.ticalc.org/archives/files/fileinfo/50/5010.html

Allows organization of files, apparently.

https://www.ticalc.org/archives/files/fileinfo/182/18213.html

Imitates the interface of DOS.

https://www.ticalc.org/archives/files/fileinfo/352/35207.html

Imitates Windows, with a start menu, cursor, and programs slots.

https://www.ticalc.org/archives/files/fileinfo/92/9293.html

Like Windows TI, except no fancy GUI, it seems.

https://www.ticalc.org/archives/files/fileinfo/1/187.html

Appears to be imitating a Powershell prompt of some sort.

https://www.ticalc.org/archives/files/fileinfo/1/191.html

A more fancy imitation, because it has a mock Windows logo. The usual “Start” menu and nothing else…

https://www.ticalc.org/archives/files/fileinfo/76/7648.html

Yet again, imitating Windows with a Start menu and nothing else. This time, it has built in programs.

https://www.ticalc.org/archives/files/fileinfo/148/14868.html

Imitations with a start menu.

https://www.ticalc.org/archives/files/fileinfo/50/5012.html

Revolutionary, because it has icons on the desktop, plus little buttons where the clock would usually be.

https://www.ticalc.org/archives/files/fileinfo/110/11025.html

Requires CrASH. Enables I2C and Networking; to what extent is unknown.

https://www.ticalc.org/archives/files/fileinfo/109/10999.html

A colorful launching shell with various interfacing supports, such as file renaming.

https://www.ticalc.org/archives/files/fileinfo/465/46574.html

Whether these emulators support operating systems for these consoles is unknown; it must be looked into further. Consoles without meaningful OSes are not included.

https://emulation.gametechwiki.com/index.php/Emulators_on_TI_Calculators

Nintendo Entertainment System – NES84

Nintendo Game Boy (no Color) – Ti-Boy CE 0.1.3

Whether these emulators support operating systems for these computers is unknown; it must be looked into further. PCs without meaningful OSes are not included.

https://emulation.gametechwiki.com/index.php/Emulators_on_TI_Calculators

CHIP-8/SuperCHIP – Chip84CE, Chip-84

It’s for “retards”, apparently.

https://www.ticalc.org/archives/files/fileinfo/474/47470.html

Whether this can interface with POP/IMPP email servers is unknown, but it seems to imply it can.

https://www.ticalc.org/archives/files/fileinfo/471/47156.html

Whether these emulators support operating systems for these consoles is unknown; it must be looked into further. Consoles without meaningful OSes are not included.

Nintendo Game Boy (no Color) – Ti-Boy CSE

https://www.omnimaga.org/ti-boy-se-game-boy-emulator-for-ti-83se84/official-ti-boy-cse-alpha-thread/

The CSE enhanced version of the classic Doors shell. Probably the fanciest looking of all the versions. Supports various interesting options.

https://www.ticalc.org/archives/files/fileinfo/456/45670.html

the pieces of KnightOS are maintained as separate projects under the KnightOS organization

Similarly compatible with the CSE. The most recent versions may support USB upload from PC, allowing this to effectively completely replace the original calculator OS.

https://knightos.org/

https://github.com/KnightOS/KnightOS (git most recent & USB, but compile difficult)

https://www.ticalc.org/archives/files/fileinfo/463/46387.html (precompiled, NO USB!!)