The 1.0 version of Librevault for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free software for Mac OS X was originally developed by Librevault. The application lies within System Tools, more precisely File Managers. We recommend checking the downloaded files with any free antivirus.
From the developer:
Librevault is an open source zero-knowledge peer-2-peer file sync tool designed with privacy in mind. Librevault encrypts all data with AES-256 and uses TLS for all transmissions. Synchronize between your devices even without the Internet connection over the local network.
You may want to check out more Mac applications, such as pdf-FieldMerge, which might be similar to Librevault.