Personally, I really like HAML. Not having to use open and close tags is a huge time saver. As a result, writing markup with HAML is much more pleasant. HAML essentially forces you to be very strict about spacing, organization, and structure. It also makes the markup easier to read. Protip: I use this pretty frequently: htmltohaml.com

The whole backend part (deployment and other scripts, business logic, web interface) is written in Perl.

Весь бэкенд (скрипты деплоя и прочие, бизнес-логика, веб-интерфейс) написан на Perl.

been programming in c for over a decade, since learning it in college. still use it for various low level projects. used it recently to develop an embedded application for a custom board.

I use Perl to rip through log files and compare them to some signature files I have created. When I get a match, it adds the bad guy to the list of shame in MySQL.

The core of the arcapos applications is written in C, so are most of the Lua modules (bindings to various hardware or protocols).

The Sqreen PHP agent is both a PHP extension, built in C, and a daemon built in Python.

A very expressive language, lets you say the same thing in many different ways

Axis2/c, rampart/c, savan/c, barbershop and custom php extensions.

Used in backend and clients for performance heavy tasks.

We use perl with rex to control our distributed systems.

I use perl on some legacy applications.