The software we developed for LDV project in the Institute for System Programming of Russian Academy of Sciences is licensed under Apache-2.0 license (you can read its text here).
However, in the distribution, which you can download, third-party components are used and, sometimes, modified. The components included are licensed under their own licenses, which are free software licenses, but not necessarily Apache-2.0. As required by the Apache-2.0 license, the list of the components included is listed in the source:NOTICE file.
All prerequisites for LDV tools (see source:INSTALL) have free implementations as well.