The standard distribution ships with the following tools:
Documentation generator
The builtin document generator nim doc generates HTML documentation from .nim source files.
Nimsuggest for IDE support
Through the nimsuggest tool, any IDE can query a .nim source file and obtain useful information like definition of symbols or suggestions for completion.
C2nim
C to Nim source converter. Translates C header files to Nim.
nimgrep
Nim search and replace utility.