The ump-ng crate is a simple client/server message passing library for intra-process communication. Its primary purpose is to allow cross async/non-async communication (for both the server and client endpoints).
ump-ng is similar to ump, but it introduces a uni-directional message passing operation.
Change log
The details of changes can always be found in the timeline, but for a high-level view of changes between released versions there's a manually maintained Change Log.
Project Status
ump-ng is in maintenance mode; it is feature-complete, but will receive bugfixes and improvements to implementation/documentation.