The main features of pcostanza/closer-mop are: CLOS Extensions, Object System Extensions.
Open-source alternatives to pcostanza/closer-mop include: alex-gutev/static-dispatch — Static generic function dispatch for Common Lisp. atlas-engineer/nclasses — A `define-class` macro for less boilerplate. digikar99/polymorphic-functions — A function type to dispatch on types instead of classes with partial support for dispatching on optional and keyword… guicho271828/inlined-generic-function — Bringing the speed of Static Dispatch to CLOS. Succeeded by https://github.com/marcoheisig/fast-generic-functions. lisp-maintainers/defclass-std — A shortcut macro to write DEFCLASS forms quickly. marcoheisig/fast-generic-functions — Seal your generic functions for an extra boost in performance.
A function type to dispatch on types instead of classes with partial support for dispatching on optional and keyword argument types.
Bringing the speed of Static Dispatch to CLOS. Succeeded by https://github.com/marcoheisig/fast-generic-functions
Static generic function dispatch for Common Lisp
