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expireddomains.net
[SITE] lists expired (aka available) domain names (listed by year)
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http://reallygoodemails.com/
[SITE] categorized collection, run by email marketing guru, Matthew Smith, founder @patterntap,
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https://google.com/webmasters
[SaaS] googles site crawling and error reporting services
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ip-addess-lookup
] a better tool for looking up ip, v4 and v6
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layoutit.com
[SaaS]css layout builder using bootstrap v3
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REPL
REPL Read Eval Print Loop - an overview of these types of tool, used in software development
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theodinproject.com
learn web development, online for free
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