Many automation tools, including expert systems and chatbots, allow for the development of apps. This category is reserved for those solutions that do not fit neatly into other automation categories, where the main capability is nevertheless the development of applications. A category leader is Fliplet, a pre-fab app development solution that provides the ability to easily create apps and knowledge delivery systems using templates and discrete widgets such as for benchmarking. Tools such as ServiceNow and Mendix also allow for custom app development.