Websites I find very valuable:
http://library.und.edu/special-collections/bygdebok/ Arne G. Brekke Bygdebok Collection. The library is undergoing a remodeling right now so the link isn't active but should be sometime again in 2020.
https://media.digitalarkivet.no/en/ Digitalarkivet Scanned records
http://www.rhd.uit.no/folketellinger/folketellinger_e.aspx Norwegian Historical Data Centre
http://www.ancestry.com/ Ancestry.com, (many records available for research - by subscription)
https://www.brekketours.com/ For trips to Norway, Brekke Tours is the top tour company in the USA.
https://www.familysearch.org/ Latter Day Saints Family Search site
http://www.fellesraad.com/vosselag.htm Vosselag page information
http://www.fellesraad.com/#F7 Fellesrad website, shows all the various lags for Norwegian/Americans
http://www.ancestorsfromvoss.com/ Website with information on Voss and database for Voss
http://www.sognalag.org/sognalag.org/Welcome.html Website for information on the Sognalag-Sogn of Fjordane area
http://usgenweb.org/ Website for each state with listings by county, helpful in research
http://www.astrimyastri.com/ Deb Nelson Gourley's publishing company for ordering English/Norwegian books, website has many very helpful links for genealogy research.
http://www.mnhs.org/ Minnesota Historical Society website
http://norwaytominnesota.blogspot.com/2011/10/help-is-just-click-away.html This is a good blog website by Margit Bakke that gives many Norway to Minnesota genealogy links and links to other websites and blogs.
http://floeene.no/deabur/death_burial_intro.htm This is a website by my friend, Ola Helge Fløene who lives in Nord Aurdal, Valdres, Oppland. The website gives information on People from Valdres dead/buried in other parts of Norway abt. 1880-1930
http://norwayancestors.com/index.php Genealogical databases of the kommunes of the Inner Sognefjord entered by Neil Hofland. Done by entering all the data from the kommunes respective bygdeboks. They are all on the website as Trees, with the Inner Sogn tree containing multiple kommunes, namely Vik, Leikanger, Balestrand, part of Sogndal, and a growing part of Luster.
http://s-aga.org/TNG/index.php A database with ancestry in the VALDRES, Oppland area and some surrounding areas of Norway. S-AGA (Scandinavian-American Genealogical Association) is a free association run by genealogists who are dedicated to creating a database, which contains all of the Scandinavians from its earliest beginnings up until modern times.