LEPL is a recursive descent parser library written in Python. It is based on parser combinator libraries popular in functional programming, but also exploits Python language features. Operators provide a friendly syntax, and the consistent use of generators supports full backtracking and resource management. Backtracking implies that a wide variety of grammars are supported; appropriate memoisation ensures that even left-recursive grammars terminate.
Flexc++ is a tool for generating scanners based on regular expressions. Flexc++ is highly comparable to the programs flex and flex++. The goal was to create a similar program, but to implement it completely in C++. Most flex and flex++ grammars should be usable with flexc++ with minor adjustments.