Voyant Tools is an easy-to-use platform for analyzing digital texts. It doesn't require programming skills, and is often a good place to start if you're not sure which form of computational analysis will be best for your project.
VoyantTools can get a word frequency count in your text, as an example.
The Distant Reader is grant-funded project that provides a tool and platform for analyzing large amounts of digital text (for example, the entire text of a journal). You can provide input text via a plain text file, a URL, or a Zip file.
Example of output from a Distant Reader analysis
You will need to create an account for yourself (it is free) and having some familiarity with a language like Python for web scraping and text processing will let you get the most out of this tool.
This beta project provides a Jupyter Notebooks-based dashboard for performing analyses of the contents of the JSTOR platform, as well as growing numbers of other digitized content contributed by project collaborators.
This website hosts an online textbook, Introduction to Cultural Analytics & Python, which offers an introduction to the programming language Python that is specifically designed for people interested in the humanities and social sciences. Includes lessons on using Pandas, basic web scraping approaches, and advice on working with social media data.