Code for Earth, an ECMWF-run partnership programme, fosters innovation and collaboration and supports advancements in weather, atmosphere and climate research, including in the Copernicus programme and the Destination Earth (DestinE) initiative, which are both EU-funded. Since its first edition in 2018, the programme has brought together talented individuals and developer teams with experienced mentors from ECMWF to work on cutting-edge projects covering a wide range of topics. In 2023, ten developer teams participated in Code for Earth. This presentation will give an insight into the programme and the current 2024 edition. It will also explain how interested people can join Code for Earth and make an impact on real-world challenges. Each summer, several individuals and developer teams from different backgrounds test, explore and/or develop open source software solutions supported by ECMWF's mentors. Their projects tackle topics such as data science in Earth-, weather-, climate- and atmosphere-related challenges, including visualisation, machine learning/artificial intelligence, user support tools and data analysis. By encouraging multidisciplinary collaboration and embracing open source principles, Code for Earth facilitates the development of cutting-edge solutions and advancements in Earth system sciences. Since its start, the programme has produced 45+ open-source software developments highly beneficial to activities at ECMWF.