The open source altern atternative7-Zip just got released in v18.01. The new version of the Windows software is the first final release of 2018. The first two digits of the version number reflect the year of release.
The new beta version of the archiving software comes with support for unpacking .obj and .coff files. The rest of the changes are more related to advance users. Normal daily users will notice that the multi-threading compression performance of LZMA2 archives such as xz and 7z got improved in the release, 7-Zip uses additional buffers for multi-block LZMA2 compression, and CPU utilization improved slightly as a consequence.
As always the changelog can be found in the official forum.