These tools should be easy to obtain, install, and use by a wide variety of users with a wide variety of skills and with possibly zero system admin support!
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Generally keep these tools as free of external dependencies as possible; well-known or bundled modules/libraries should be fine (e.g., Perl includes a bunch of bundled modules that every Perl installation probably has - those are okay).
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If an external dependency is unavoidable and your app's language doesn't have a convenient built-in way to obtain it, please provide one.
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These tools should not require a build step.
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These tools should use languages and interpreters that are likely to be already installed on a user's system. Perl, Python, bash shell scripts are good choices. Node.js, while pretty cool, is probably not a good choice.
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Make sure you have the rights and permissions to contribute tools to this repo. The repo itself is nominally licensed under the Apache 2.0 license (http://www.apache.org/licenses/LICENSE-2.0), but individual applications can be licensed under alternative licenses.