Git, the open source distributed version control system created by Linus ... But a key portion is not; while the code for fetching files and interacting with a remote Git repository is all open ...

The IRS has released the vast majority of the code used to develop its Direct File program, theoretically allowing anyone to build their own versions.

Some are commercial, such as IBM Rational's Clearcase or Microsoft's Visual SourceSafe; others are open ... control for any source code (whether it be C, C++, Java, VHDL, Verilog, and so forth) should ...