December 24, PyPy development team announced the release of the latest version PyPy 7.3.
December 23, the development team of Prometheus released the latest stable release Prometheus 2.15.0.
December 20, Apache Kylin development team announced the latest major release of Apache Kylin 3.0.0. Many improvements focus on realtime OLAP features.
December 24, Darktable development team announced Darktable 3.0. It is the latest major release. With a new GUI, there are a lot of feature improvements.
December 19, the Mozilla Rust developer team announced the release of Rust 1.40.0.
December 18, Czech JetBrains announced IntelliJ IDEA 2019.3.1, the latest version of their integrated development environment for Java and other programming languages.
December 11, Development team of Apache Spam Assassin released the lates stable version SpamAssassin 3.4.3.
December 5, development team of CKEditor announced the release of CKEditor 5 v16.0.0. The two major features are code block support and restricted editing.
December 13, Vim 8.2, the latest version of text editor Vim, was released. One of the major changes is the support for popup windows.