Does the country publish the lists of parties and/or candidates registered for elections online?

Electoral Code of the Republic of Belarus [Amended as of June 4, 2015]

Article 13

Public Openness During Preparation and Holding of Elections and Referendum and Recall of a Deputy of the Chamber of Representatives, a Member of the Council of the Republic and a Deputy of the Local Council of Deputies

The respective commissions, local representatives and executive and administrative bodies shall inform citizens about their work on preparation and holding of elections, the referendum or recall of a deputy of the Chamber of Representatives, a member of the Council of the Republic and a deputy of the local Council of Deputies, on the formation of electoral districts, on the composition, the place of location and the working time of the commissions and the lists of citizens who have the right to take part in the elections, referendum or voting for recall of a deputy, candidates, results of the vote, elections, referendum and recall.

The lists of parties and candidates registered for the 2016 Legislative elections are available here and the 2012 Legislative elections are available here.