This journal, established in 2008, from the Australian National University presents ‘outstanding essays taken from ANU undergraduate essay submissions.’ [quoted from website].
List of undergraduate research journals, on the British Conference of Undergraduate Research (BCUR) website.
List of undergraduate research journals, on the Council of Undergraduate Research (CUR) website.
Reinvention takes ‘submissions from any undergraduate student, worldwide, including student-staff collaborations (student must be lead author).’ The journal was launched in September 2007 by the University of Warwick and Oxford Brookes University; since 2012, the journal has been produced, edited and managed by students and staff at Monash University and the University of Warwick. [quoted and adapted from the website]
More journals can be found here