Careware (also called charityware, helpware, or goodware) is software licensed in a way that benefits a charity.
Stevens was developing a user interface library and publishing the source code in monthly installments.
To distribute code to readers, Stevens suggested they send him an addressed stamped mailer with a blank diskette.
He also suggested that to express their appreciation they include a dollar, which he would donate to the local food bank in Brevard County, Florida.
"[6] For example, the vim text editor is free software but includes a request from its author, Bram Moolenaar, that users donate to ICCF Holland for work to help AIDS victims in Uganda.