Here are some general rules that should be followed.
Follow this general outline:
BOLD items are required.
Title of the product with a link to the download/main page.
Quote the site's product summary.
Add any pictures that are relevant to the question.
If it's not installed using a normal installation file, or package manager, then give instructions on ...
Leave a comment under the answer
That would be enough to inform future reader who is interested in the tool that it is no longer available.
That would be enough to inform the community to downvote the answer as in current state the answer is wrong
That would be enough to inform the answerer that the link gone broken, and whether they want to fix it or not
The existing wiki answer has great discussion and comments, but I believe the embedded example conflicts with current site standards. The example would be a response to a request for a software list, which would be off-topic (it is a long general description of features and benefits that is not specific to the question and does not provide an actual ...
A quick look at his edits looks like he's just fixing up links and formatting. The quality of these edits at a glance seem... ok, and he's actually taking the effort to write good edit reasons. Seems fine to me!
While there's no official standard formatting, he dosen't seem to be doing that many edits a day, and well, its an improvement.
Initially I ...
For spam with a malicious link, flag as spam and vote to delete if you can. Usually I'm against editing spam posts, but if it is a likely malicious link it certainly makes sense. The spam flag is important as it auto-deletes after 6 flags.
For a legitimate user just remove the link and comment, there is likely no need to delete the post.
Until mid-2010, all links counted toward the limit. This is indeed to prevent spam. Since intra-SE links aren't going to be of much use to spammers (as mentioned by Journeyman Geek in the comments), there was an MSE feature request to exempt them from the accounting. It was approved, implemented (cf. status-completed), and is now in effect.
Some link only answers can be okay if they are specifically telling us what exactly is at the link and showing why it cannot be copied. While we prefer a step by step solution here there isn't really a problem if there is a real reason the answer is a link.
For this reason I would apply the same reasoning and quality requirements we have as I would an answer ...
Any links found in the question, answers or comments will appear in the Linked list on the sidebar. These are manual, by the users.
Those that appear in the Related list are automatically selected by the system.
Links in comments and other posts do not count toward the count toward the share badges.
In order to add toward the count, you have to link to the post from a site that is not on the Stack Exchange network.
Should a post like this be flagged for moderator intervention?
No, it shouldn't be flagged just because the link is broken, moderators are already overloaded.
What else you can / should do:
flag it for other reason if you find a valid one - as pointed out already in the previous answer
down-vote - sure, sooner or later there will be enough to move it ...
Its not very hard to paraphrase an answer, and if you actually read and understood the source, to actually add something to it.
I think the academic way of quoting (well sans citations) is a pretty good way to go about it.
Firstly - essential information needs to be in the answer, and where necessary, explained for the target audience - in this case, while ...
If it is only a link, it should be a comment.
The linked content may be a valid answer, but that doesn't prevent link rot. If the information is valid and helpful, it must be replicated. The information to solve the problem has to exist on Super User.
Disclaimer: Always cite your sources!
If the amount of work that would be required to summarize the ...