Breedbase is a web-based, comprehensive breeding management and analysis software. It can be used to design field layouts, collect phenotypic information using tablets, support the collection of genotyping samples in a field, store large amounts of high density genotypic information, and provide Genomic Selection related analyses and predictions. Breedbase supports the Breeding Application Programming Interface (BrAPI) standard which defines data objects and methods for exchanging breeding data. The Breedbase system has evolved from the Sol Genomics Network (SGN) and Cassavabase and related sites (see RTBbase.org). There are a number of instances running for diverse crops, including Cassava (https://cassavabase.org, sweet potato (https://sweetpotatobase.org), banana (https://musabase.org), rice (https://ricebase.org), tomato and other Solanaceae (https://solgenomics.net/) and many others. The Breedbase manual provides detailed information about available features.