Erlang is a programming language used to build massively scalable soft real-time systems with requirements on high availability. Developed by Ericsson
License: Open Source
C# is a robust, versatile language primarily used in enterprise applications with a strong focus on performance and tooling support. Erlang excels in concurrent, distributed, and fault-tolerant systems, making it ideal for real-time applications, though it has a steeper learning curve and fewer libraries.