Leo
1. <language> A general-purpose systems language, syntactically like Pascal and Y, semantically like C.
["The Leo Programming Language", G. Townsend, CS TR 84-7, U Arizona 1984].
2. <application> A general data management environment which can show user-created relationships among any kind data. It can also be used as an outlining editor as it embeds the noweb and CWEB markup languages in an outline context.
Leo is written in pure Python using Tk/tcl and so runs on Windows, Linux and MacOS X. It isdistributed under the Python License.