Github doesn't make the distinction between OS or not. It's free if the repository is public, that is not the same thing as being open source.<p>The codeclimate link goes to a signup page, not an open source project information page.<p>jClarity says "So we offer a free license for use on your <i>non-commercial</i> Open Source projects". That's a interesting and hard to define restriction.<p>Lighthouse says "Create as many Open Source Projects as you wish on any plan". That's not saying there is a free plan for open source projects, there are no free plans in their case.
To add to your devtools list as you asked in your article :<p>OAuth.io "OAuth-as-a-service" is also free for open source projects, by using directly the open source daemon oauthd for 80+ providers <a href="https://github.com/oauth-io/oauthd" rel="nofollow">https://github.com/oauth-io/oauthd</a><p>disclosure : I work for OAuth.io
Travis CI is as free for Open Source as Github is; Notably, it also makes some of the other tools even sweeter (Like Code Climate, Sauce Labs, Github itself).<p>It's a little bit ironic that we can't alter the blog post about open source directly through comments, and instead have been asked to use Hacker News.
Moqups[1], our HTML5 based mockup/wireframing app, is completely free for education, non profit and open source projects. To our great surprise, we get a fairly large amount of requests each week from many universities and from open source developers. Aaaand we're happy to fulfill all of them :-)<p>[1] <a href="https://moqups.com" rel="nofollow">https://moqups.com</a>
Codenvy offers free Premium subscriptions for OpenSource projects. <a href="https://codenvy.com/pricing" rel="nofollow">https://codenvy.com/pricing</a><p>We haven't completed our automated application form yet. But if you contact us directly, we can configure the accounts.
You also forgot LiveCode, a RAD application that uses a variant of AppleScript to do quick UI and function prototyping for cross-platform open-source applications.<p><a href="http://livecode.com/" rel="nofollow">http://livecode.com/</a>
Red Gate also offers free licenses for its products: <a href="http://reflectorblog.red-gate.com/2013/07/open-source/" rel="nofollow">http://reflectorblog.red-gate.com/2013/07/open-source/</a>
I haven't used them (yet, I'm planning on it) but Bugsense is free for OS.<p><a href="http://www.bugsense.com/pricing" rel="nofollow">http://www.bugsense.com/pricing</a>
Gratis isn't enough. Free software requires free tools:<p><a href="http://mako.cc/writing/hill-free_tools.html" rel="nofollow">http://mako.cc/writing/hill-free_tools.html</a><p>A great example of truly free code hosting, in the only sense of "free" that actually matters, is Rhodecode. Have them host it for you:<p><a href="https://rhodecode.com/" rel="nofollow">https://rhodecode.com/</a><p>Or host it yourself, no possibility of vendor lock-in:<p><a href="https://rhodecode.com/docs/" rel="nofollow">https://rhodecode.com/docs/</a><p>And it does both git and hg. We need more of this.
Disclosure: I work for Excelsior.<p>Excelsior JET (<a href="http://www.excelsiorjet.com" rel="nofollow">http://www.excelsiorjet.com</a>), a Java SE JVM with a native code compiler and deployment toolkit, is free for non-commercial use. Note that "non-commercial" != "open source", both ways: there is commercial open-source and closed-source freeware.<p><a href="http://www.excelsior-usa.com/jetfree.html" rel="nofollow">http://www.excelsior-usa.com/jetfree.html</a>
wercker is a continuous delivery platform which is also free for open source (and private projects as well)<p><a href="http://wercker.com" rel="nofollow">http://wercker.com</a><p>disclosure: I work for wercker.