GitHub - Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.
HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
GNU Wget - GNU Wget is a free software package for retrieving files using HTTP(S) and FTP, the most...
BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.
WebCopy - Cyotek WebCopy is a free tool for copying full or partial websites locally onto your harddisk for offline viewing.