Dev Tools with Free for Open Source Plans

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.

The codeclimate link goes to a signup page, not an open source project information page.

jClarity says "So we offer a free license for use on your non-commercial Open Source projects". That's a interesting and hard to define restriction.

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 :

OAuth.io "OAuth-as-a-service" is also free for open source projects, by using directly the open source daemon oauthd for 80+ providers https://github.com/oauth-io/oauthd

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).

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 :-)

[1] https://moqups.com

Codenvy offers free Premium subscriptions for OpenSource projects. https://codenvy.com/pricing

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.

http://livecode.com/

Red Gate also offers free licenses for its products: http://reflectorblog.red-gate.com/2013/07/open-source/

I haven't used them (yet, I'm planning on it) but Bugsense is free for OS.

http://www.bugsense.com/pricing

Gratis isn't enough. Free software requires free tools:

http://mako.cc/writing/hill-free_tools.html

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:

https://rhodecode.com/

Or host it yourself, no possibility of vendor lock-in:

https://rhodecode.com/docs/

And it does both git and hg. We need more of this.

Codeship - Hosted continuous deployment platform https://www.codeship.io

Disclosure: I work for Excelsior.

Excelsior JET (http://www.excelsiorjet.com), 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.

http://www.excelsior-usa.com/jetfree.html

wercker is a continuous delivery platform which is also free for open source (and private projects as well)

http://wercker.com

disclosure: I work for wercker.