libkml

If you're looking for a software library that can help you parse, generate, and operate on KML, then look no further than libkml - a free and open source library that's designed to do just that.

One of the biggest benefits of using libkml is that it's built on top of the OGC KML 2.2 standard, which means that you can trust it to handle all of your KML files with ease. Additionally, libkml is coded in C, which means that it's extremely fast and efficient even when working with large files.

Of course, not everyone uses C as their primary programming language - which is why libkml also has bindings available via SWIG to Java and Python. This makes it easy for developers who work in those languages to take advantage of everything that libkml has to offer.

It's also worth noting that libkml is licensed and distributed under the terms of the New BSD License, which means that you can use it freely in both open source and commercial projects without any worries about legal or licensing issues.

Overall, libkml is an excellent choice for anyone who needs to work with KML files on a regular basis. It's fast, efficient, and reliable - and best of all, it's completely free and open source!