Limnor is the first general-purpose codeless visual programming system in the world. It can be used to create computer software without using computer languages. Because developers can add their desired features to the Limnor system via Limnor SDK, there is virtually no limit to what this system can do. Limnor supports fundamental programming capabilities such as Loop (recursive execution) Branch (conditional execution.) User-defined mathematic expressions support common mathematic operations and about 30 common functions and constants. Users may add any kinds of new math functions via DLLs. Bitwise operations. User defined logic expressions supporting AND, OR, NOT, >, >=, =, <, <=, <>(not equal), and grouping by "(" and ")" String operations arrays user-defined variables.