A programming language that understands what a web app is
Wasp (Web Application Specification Language) is a declarative DSL (domain-specific language) for developing, building and deploying modern full-stack web apps with less code. Concepts such as app, page, user, login, frontend, production, etc. are baked into the language, bringing a new level of expressiveness and allowing you to get more work done with fewer lines of code.
...With Haskell and Nix we use the most reliable technologies available, to make sure your application will never crash because of Null Pointer Exceptions. IHP comes with everything you need to build great web applications out of the box. IHP is a batteries-included web framework, optimized for longterm productivity and programmer happiness. With IHP all your application code is written in Haskell - a functional programming language with an incredible type system, used by giants such as GitHub and Facebook. Thanks to Haskell's impressive type system you can write code that is far more robust than you have seen before.
wikit is another wiki engine suited for small teams. It’s written in Haskell with using Yesod Web Framework. It’s cross platform and was designed to be running as a desktop service application servicing wiki articles and providing some basic capabilities in terms of searching and storing data.
It’s perhaps most distinct feature is that it relies on backing Git distributed source control system. And keeps it’s articles in markdown format.