I have created a website dedicated to improving learners' writing in English: Gregory's Writing Site. Feel free to take a look.
If you write academic papers, feel free to try out my Reference Checker. It's a free online tool for cross-checking all the references in a paper with the bibliography. It has even been called "one of the best things you can find on the internet" (and not by me)!
I have a new website, cendipede.org, which will present the product of my doctoral thesis project, the Corpus-Derived Profiles framework, and the Java implementation of the framework, known as CenDiPede. Check it out if you're interested in studying word meaning in corpora.
I'm the creator of Dexter, a suite of software tools for the analysis of linguistic data. It's free software that helps you do detailed analyses of spoken or written texts. Feel free to try it out!