TeXstudio is a fully featured LaTeX editor. It is designed to make writing LaTeX documents as easy and comfortable as possible. It features an integrated PDF viewer with (almost) word-level synchronization, live inline preview, advanced syntax highlighting, and live checking of references, citations, LaTeX commands, spelling, and grammar.
WordPress FAQ is a cool plugin for creating your FAQ section . It has a lot of parameters to set, and it will allow you set your own theme from scratch. It has a user-friendly front-end and back-end interface, allowing you to set all parameters quickly and easily. FAQs have SEO-friendly URLs.
Joomla contact form builder extension is a complicated tool for making submission forms for your Joomla website. It permits you to specify parameters like colors and fonts. It can use a Google map when given an address or geographical coordinates (longitude and latitude), and the user can drag the marker to the required location.