There was a download of Fopnu 1.61 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The most popular versions of the software 1.4 and 1.2.
The program lies within Internet & Network Tools, more precisely Network Tools. The program's installer is commonly called fopnu.exe or fopnu_Windows64bit.exe etc. This free program was originally designed by Tixati Software Inc. We recommend checking the downloaded files with any free antivirus.
From the developer:
Fopnu is a new and powerful P2P file sharing system, it is simple and easy to use, fully decentralized network, all shared files are indexed locally, no relaying of other user's searches, pure UDP protocol that utilizes forward error correction. Full connection encryption and decentralized public key infrastructure.
You may want to check out more software, such as ArpCacheWatch, Onlineeye Pro or Alchemy Eye, which might be similar to Fopnu.