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Editor Assembler is a native development system for the TI-99/4A. It features a text editor, a TMS9900 machine code assembler, and sample code including an assembler version of "Tombstone City".
IBM Typing Tutor is an educational program sold by IBM alongside their original IBM PC. The software itself was licensed from Microsoft, and is notable as being one of only two known commercial programs that were sold for the IBM PC on cassette tape. (The other being IBM PC Diagnostics )
Plan 9 from Bell Labs was a research operating system to improve on the ideas of UNIX. It was a radical revolution - everything was a file, even network sockets, and the system, while CLI based, was improved to take advantage of graphical machines.
TI-Logo is an implementation of the Logo educational programming language that makes extensive use of graphics manipulation.