This is Sf, an isomorphic, recursive and minimalistic client/server side framerwork to easily develop modular and light-fast web applications. Access public. This is an open source software conceived within the frame of the Institute of Italian culture (NGO), and originally implemented by Thomas de Vivo (tdvit@mail.com) It is published under the following license: everyone can copy, use, modify and redistribute this software provided that every copy of it (including the partial use of its code) will retain the current disclaimer or in this form, or using the following short notice: "(C) 2016 Institute of Italian culture (NGO) -- www.istitutoculturaitaliana.org/sf" (even compacted in one line) (the provided link will contain a description of the software and the complete license.) The software is provided "as is": without any warranty (including its eligibility for whatever kind of purpose), and both the copyright owners and the contributors are excluded from any liability related to the use of it, even if instructions and recommendations of use will be provided with such software or any derivative or related work.