My Esolangs:

• Minus (2007) - A very simple imperative language with only one instruction, yet decently expressive with a 227 character self interpreter.
• Golfscript (2007) - Arguably the first ever golf language, not without its flaws but surprisingly powerful for how simple it is.
• Universal Lambda (2008) - Implementation of John Tromp's binary lambda calculus using bytes with church encoding for IO.
• Nibbles (2021) - My attempt to bring simplicity back to golf languages, about 3x smaller on average than Golfscript. Functional programming in half-byte instructions.
• Atlas (2022) - An experiment to test out infix notation and vectorization. It is a functional language with no way to create functions, yet expressive even for folds/scans thanks to circular programming. It is in Beta and has some issues - I recommend using iogii instead.
• iogii (2024) - Similar to Atlas, but with postfix notation and a tacit syntax for folds/etc. The emphasis is on simplicity but it is very concise. It is currently in Beta - released Oct 29.