| async | SafeC Standard Library — async: everything that runs on any target |
| channel | SafeC Standard Library — async: channels (oneshot, bounded MPMC) |
| combinator | SafeC Standard Library — async: combinators (join, select, timeout, map, and_then) |
| coro | SafeC Standard Library — async: stackless coroutines with goto |
| executor | SafeC Standard Library — async: tasks, JoinHandle, the local executor |
| future | SafeC Standard Library — async: futures, Poll, Waker, Context |
| host | SafeC Standard Library — async: hosted parking and block_on |
| net | SafeC Standard Library — async: I/O driver, Runtime, async TCP |
| pool | SafeC Standard Library — async: ThreadPool, the multi-threaded executor |
| sync | SafeC Standard Library — async: Mutex, Semaphore, Notify, cancellation |
| timer | SafeC Standard Library — async: timers (Sleep, Interval, a timer queue) |