Osiris Serverless Portal System (usually abbreviated as Osiris sps or Osiris) is a freeware program used to create web portals distributed via peer-to-peer networking (P2P) and autonomous from centralized servers. It is available for Microsoft Windows and Linux operating systems. Unlike common tools used to publish information on the Internet, such as content management systems, Internet forums or blogs based on a centralized system, the data of an Osiris portal are shared (via P2P) between all its participants. Because all the contents necessary for navigation are replicated on every computer, the portal can be used without a central server. Thus, the portal is always accessible because it is immune to denial of service attacks, Internet service provider limitations (such as traffic shaping and censorship) and hardware failure. In this way, a web portal can be operated at very low costs and free from external control. History Osiris was started by a developer named "Berserker" as an outgrowth of KeyForum. Osiris was written in C++ and designed to be decentralized, indestructible and expand beyond a simple a web forum. "Clodo" joined the project several months later. Osiris was officially announced on October 2, 2006 after 2 years of development. The team is composed of 2 developers (Clodo & Berserker), two employees (DanielZ and Rei.Andrea) and a group of supporters/beta-testers (many of whom were already on the team KeyForum). Starting from version 0.12, Osiris has become multi-platform, this was possible by migrating from the Visual Studio to the wxWidgets library. Key features Osiris is the result of a union between peer-to-peer (P2P) technology and web portals. It allows anyone to create a web portal for free, without depending on anyone or needing special technical knowledge. Allows one to create content anonymously, allowing one to contribute to freedom of expression and speech. Osiris offers a full-text search engine that allows searching across all portals' content. Low resource utilization: with the increase of users in a portal there is a reduction of the workload on single nodes, as work is distributed among all network nodes. Uses P2P infrastructure (based on Kademlia) for the portals distribution, a field where there are few and difficult-to-use alternatives. Administration is based on the reputations system, which is a new way to manage users in a distributed system without using central servers. Basic concepts Osiris differs from classic P2P programs in that it is focused on security and distributed