S4 is an SNS(Social Networking System) constructed with Bourne Shell and SQLite3. Main purpose of S4 is to build prototyping system for assessment of the first introduction of some information system.
You can obtain s4 via Mercurial repository as below.
hg clone https://www.yatex.org/hgrepos/s4
設置サンプル S4square へどうぞ。 招待メイルを出します(捨てアドレス可)。 https://www.yatex.org にあるアドレスまで連絡ください。