http://www.legilux.public.lu/
This link leads to the official Service Central De Legislation of Luxembourg, a database of current legislation in force. It is free of charge and in French.

http://www.lexadin.nl/wlg/legis/nofr/eur/lxwelux.htm
A collection of Luxembourgian legislation on Lexadin, a legal database, free of charge and in French.

http://www.mj.public.lu/legislation/index.html
The official website of the Ministry of Justice of Luxembourg. It offers a broad variety of Luxembourgian legislation for free and in French.

http://www.mj.public.lu/juridictions/cour_constitutionnelle/index.html
The section of the Constitutional Court of Luxembourg on the website of the Ministry of Justice. It offers several recent decisions of the court free of charge and in French.