According to the description posted on the official website of the developers, Chilkat is actually a library of APIs, SDKs that help users create and maintain their applications. It supports a wide range of products and the API is very flexible when it comes to coding.
Chilkat is also used in the following areas: ASP, C, C++, C++ Builder, C#, DataFlex, dBase, Delphi, Electron, Excel, FoxPro, Java, Mono, Node.js, Objective-C, Perl, PHP, PowerBuilder, PowerShell, PureBasic, Python, Ruby, SQL, Swift, Tcl, VB.NET, VB6, VBScript, Xbase++, xHarbour, Xojo.