This area of repository contains different libraries with various add-on formats which were not included in the main runtime library – because they are not so popular, or they're big, or they contain other JVM runtime dependencies.
For convenience, they have same groupId, versioning and release cycle as main runtime.
kotlinx-serialization-runtime-configparserAllows deserialization of Config object from popular lightbend/config library into Kotlin objects. You can learn about "Human-Optimized Config Object Notation" or HOCON from library's readme.
com.sksamuel.avro4k:avro4kThis library allows serialization and deserialization of objects to and from Avro. It will read and write from Avro binary or json streams or generate Avro Generic Records directly. It will also generate Avro schemas from data classes. The library allows for easy extension and overrides for custom schema formats, compatiblity with schemas defined outside out of the JVM and for types not supported out of the box.
com.github.jershell:kbsonAllows serialization and deserialization of objects to and from BSON.
net.devrieze:xmlutil-serializationThis library allows for reading and writing of XML documents with the serialization library. It is multiplatform, but as the xmlutil library (which handles the multiplatform xml bit) delegates to platform specific parsers each platform needs to be implemented for each platform specifically. The library is designed to handle existing formats that use features that would not be available in other formats such as JSON.
com.charleskorn.kaml:kamlAllows serialization and deserialization of objects to and from YAML.