Naturally the page format can be perfectly OpenSource, there are many FOSS applications to create a web page, there are even forks from Wikipedia. But the page as such is one thing and the content is another, apart from the page it must also be hosted on a server, not everyone has a server at home to be able to host a voluminous page and allow a large number of visitors on a daily basis. F(L)OSS is great for apps, but when you like to build a stable online service not so. As with the Wikipedia, you can fork the page, but you have to put the contents and you have to host it in a stable server (and also pay it). Apart from AlternativeTO, one of my favorite page is this one, with online and ofline apps (freeware), build by two brothers electricians in their spare time and own money, but with an outstanding quality, good and fast user support and a excellent TOS and privacy (anónimous, no tracksn o ads, no costs, no registring and do what you want with it) https://www.ssuitesoft.com/categories/webapps.htm Not FLOSS but equivalent