R is an open source programming language and software environment for statistical computing and graphics that is supported by the R Foundation. Developed by Ross Ihaka and Robert Gentleman
License: Open Source
Tcl is a versatile scripting language known for its simplicity and extensibility, making it ideal for rapid prototyping and GUI development. In contrast, R is specifically designed for statistical computing and data analysis, offering a rich ecosystem of packages and tools for data manipulation and visualization.