You might want to check out Squirrel[1]. It has some major differences when compared to Lua[2], such as a C-style syntax and true objects, but like Lua is known for easy embedding in C and C++. The Source Engine includes Squirrel as one of its supported scripting languages[3], and it's used in non-gaming applications such as the Code::Blocks IDE.
There is also a squirrel fork SquiLu[1] that add some Lua code (like pattern matching, some stdlib), extend it with string IO, have several extensions (sqlite3, http server, mpdecimal, axtls, curl, ...), accept a subset of Javascript/Java/C/C++, ...
[1]:https://github.com/mingodad/squilu