The KIM development team is pleased to announce the release of version 2.0.0-beta.0 of the KIM API package. The package has been completely rewritten, offering a simpler interface with many improvements and new features.
This new API is not backwards compatible. In fact, many features available in version 1 of the API are no longer supported. This was done deliberately, after careful consideration, to simplify the interface and maximize the likelihood of simulators and models working together.
For more information on the features of KIM API v2 see the new documentation. To see a summary of the differences between KIM API v1 and KIM API v2, see this page. There is a Guide to porting content from KIM API v1 to v2. Also see the NEWS, README, and INSTALL files in the KIM API package root directory after downloading and extracting the package.
Here is a download link to the new kim-api-v2.0.0-beta.0.txz package. Or, you can find this release of the KIM API package listed on the KIM API Previous Versions page.