You can get AbanteCart extensions from two different sources.
Extensions offered on this page are provided by the AbanteCart community. We welcome any developers to contribute and develop extensions to the project. These extensions can be downloaded and installed with simple FTP to AbanteCart extensions directory
Some extensions are commercialized and can be installed from AbanteCart control panel. This is is simple as installing app on smartphone or tablet. Extensions can be downloaded, installed and managed in the control panel of AbanteCart. This extensions are offered with commercial grade QA and support.