fast_mail_parser is a Python library for .eml files parsing. The main benefit is a performance: the library is much faster than python implementations. Based on mailparse library using pyo3.

Html Agility Pack (HAP) is a free and open-source HTML parser written in C# to read/write DOM and supports plain XPATH or XSLT. It is a .NET code library that allows you to parse "out of the web" HTML ...