MMgc is the Tamarin (née Macromedia) garbage collector, a memory management library that has been built as part of the AVM2/Tamarin effort. It is a static library that is linked into the Flash Player but kept separate, and can be incorporated into other programs. MMgc is not only a garbage collector, but a general-purpose memory manager. The Flash Player uses it for nearly all memory allocations.
![MMgc - Archive of obsolete content | MDN](https://cdn-ak-scissors.b.st-hatena.com/image/square/e51bd6dc33a667d35eb4146698a198e55ff92d6e/height=288;version=1;width=512/https%3A%2F%2Fdeveloper.mozilla.org%2Fstatic%2Fimg%2Fopengraph-logo.72382e605ce3.png)