Programming environments have evolved from purely text based to using graphical user
interfaces, and now we see a move towards web based interfaces, such as Jupyter. Web
based interfaces allow for the creation of interactive documents that consist of text and
programs, as well as their output. The output can be rendered using web technology as,
e.g., text, tables, charts or graphs. This approach is particularly suitable for capturing data
analysis workflows and creating interactive educational material. This article describes
SWISH, a web front-end for Prolog that consists of a web server implemented in SWI-
Prolog and a client web application written in JavaScript. SWISH provides a web server
where multiple users can manipulate and run the same material, and it can be adapted
to support Prolog extensions. In this paper we describe the architecture of SWISH, and
describe two case studies of extensions of Prolog, namely Probabilistic Logic Programming
(PLP) and Logic Production System (LPS), which have used SWISH to provide tutorial sites.