Now that I've finished writing code in 100 different programming languages, here is a summary of the (mostly lesser-known) languages I used, along with links to my code and notes, unscientifically grouped into categories. (Obviously, some languages could fit into more than one category, but I decided to list each language only once.)

The languages I enjoyed the most were the following (in alphabetical order):

• 8080 assembly: the language of the first home computer kit, the Altair 8800
• Common Lisp: a pragmatic Lisp, with numerous compatible implementations
• Factor: a modern concatenative/stack-oriented language
• Futhark: data-parallel language that's easy to write
• J: open source array-oriented language
• Nim: honestly, the language I'm most excited to try again
• Piet: 2D, pixel-based, stack-oriented esoteric language
• Prolog: the most popular language for logic programming
• Rebol: a tiny but powerful scripting language that didn't quite catch on
• Tcl: a scripting language that is beautiful in its simplicity
• Turbo Pascal: the world's tiniest integrated development environment
• Unison: pioneering content-addressable code management/sharing

Now, without further ado, here is The List:

Array

Assembly

Block-based

Concatenative

Data-oriented

Declarative

Esoteric

Functional

Hardware description

Homoiconic

Lisp-inspired

Rebol-inspired

Imperative

Scripting

High-level

Low-level

Historical

Object-oriented