The ones I use most are:<p><a href="https://www.sec.gov/" rel="nofollow">https://www.sec.gov/</a><p><a href="https://www.ssa.gov/" rel="nofollow">https://www.ssa.gov/</a><p><a href="https://data.bls.gov/" rel="nofollow">https://data.bls.gov/</a><p><a href="https://dmv.ny.gov/" rel="nofollow">https://dmv.ny.gov/</a><p><a href="https://www.irs.gov/" rel="nofollow">https://www.irs.gov/</a><p>All are useful and well-designed in my opinion.<p>I don't think they should be judged on "looking outdated" though. Functionality and security are what's important, and if it's too visually polished, I look at that as maybe even a negative indicator of functionality.
For Australia the mobile version of <a href="http://m.bom.gov.au/vic/melbourne" rel="nofollow">http://m.bom.gov.au/vic/melbourne</a> is great
<a href="https://www.gov.uk/" rel="nofollow">https://www.gov.uk/</a><p>I found these talkson the process of building and maintaining it very useful<p><a href="https://vimeo.com/121348831" rel="nofollow">https://vimeo.com/121348831</a>
<a href="https://www.infoq.com/presentations/gov-uk-devops" rel="nofollow">https://www.infoq.com/presentations/gov-uk-devops</a>
Usability.gov; I found their take & format on use cases useful:<p><a href="https://www.usability.gov/how-to-and-tools/methods/use-cases.html" rel="nofollow">https://www.usability.gov/how-to-and-tools/methods/use-cases...</a>