The source repository for weinre is maintained at Apache. See the archives information on the Installing page for more information on downloading a source archive.
If you'd prefer to obtain the source via git, you can use one of the following repos:
The Apache repo is the canonical repo. The url can be used in a web browser, or as the argument of a git clone command.
The GitHub repo is a clone of the Apache repo, and automatically shadowed at some regular interval. The url is the web view of the repo, from which you can obtain a url to use with git clone.
See the file README.md in the top-most directory of the source distribution for more instructions on how to perform a build. A markdown-processed version of the README file is available on GitHub.