Political Science

International organizations (treaty organizations, economic and political alliances and unions) come in a number of forms. Their sites (particularly for treaty organizations and alliances) often have .int at the end of their URLs.

While it is fairly common for countries to have a publicly available website (or several such sites) for their various departments and agencies, not all do. Among those that do, some are more complete than others, some provide greater access to documents and tools than others, etc. While many have sites or documents available in multiple languages (including English), some do not. This can make it a bit tricky to find what you're looking for!

Some ways to find official government sites:

• Search for the country name and gov.[ccTLD]. Australia's main government site portal, for example, is found at https://www.australia.gov.au/, where .au is the ccTLD (country code top level domain). You can find a complete list of country codes at the ICANN Wiki. Not all countries use the .gov in their government URLs (see, for example, the homepage for the Czech Republic), but you can still try searching for the country name or government body name with the ccTLD in order to find their sites. For some Spanish-speaking countries (particularly in South America), you might have better luck looking for gob.[ccTLD] instead of gov.[ccTLD]. 
• Use a source like the CIA World Factbook to find the actual names of government bodies or agencies and search specifically for those bodies or agencies, ideally in their original language. You may also have better luck searching if you use the country's full name for itself in its own language ("Bundesrepublik Deutschland" or "Federal Republic of Germany" for Germany, etc.).
• Find the country's embassy site through the UN's Blue Book directory of member states with permanent missions to the UN and see if the provided contact info includes links to the main national government site(s) (they often do!). Note: These links are not very well-maintained, and a fair number of them may no longer work.
• You may also find links to official government sites in reference works online (Wikipedia often includes them in entries about a country, for example).

Be careful not to confuse a tourist site (which may be run by a foreign affairs or tourism ministry) for a main government site. When you do find a government or government agency's site, take some time to click around on it to find links to other agencies or parts of the government. Some national governments (like Ghana, for example) have individual sites for their particular ministries and offices, but no single portal site through which to reach them; these are cases in which finding ministry names and searching for them along with the ccTLD code would be useful.