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copied!<p>Distributed Version Control Systems (Mercurial, Bazaar, Git) are nice in that they can be completely self-contained in a single directory (.hg, .bzr, .git) in the top of the working copy, where Subversion uses a separate repository directory, in addition to .svn directories in every directory of your working copy.</p> <p>Mercurial and Subversion are probably the easiest to use on Windows, with TortoiseHG and TortoiseSVN; the Bazaar GUIs have also been improving. Apparently there is also TortoiseGit, though I haven't tried it. If you like the command line, <a href="http://www.gnome.org/~newren/eg/" rel="nofollow noreferrer">Easy Git</a> seems to be a bit nicer to use than the standard git commands.</p> <p>I'd like to address point 4, common libraries, in more detail. Unfortunately I don't think any of them will be too easy to use, since I don't think they're directly supported by GUIs (I could be wrong). The only one of these I've actually used in practice is Subversion Externals.</p> <p>Subversion is reasonably good at this job; you can use Externals (see the chapter in the SVN book), but to associate versions of a project with versions of a library you need to "pin" the library revision in the externals definition (which is itself versioned, as a property of the directory).</p> <p>Mercurial supports something similar, but both solutions seem a bit immature: subrepository support built-in to the latest version and the "Forest Extension".</p> <p>Git has "submodule" support.</p> <p>I haven't seen anything like sub-respositories or sub-modules for Bazaar, unfortunately.</p>

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