OpenRefine (formerly Google Refine) is a powerful tool for working with messy data: cleaning it; transforming it from one format into another; and extending it with web services and external data.
Github: https://github.com/OpenRefine/OpenRefine
Written in Java 8.
An excellent blog post on how Wordpress backdoors work, how they're hidden, and how they're used.
How to clean punctuation marks out of strings represented as lists in Python without needing to build or import a full text parser. The second answer is the most straightforward but not necessarily the most Pythonic.