Faculté des Sciences 
UCLouvain Faculty of Science 
Institut de recherche en mathématique et physique 
UCLouvain Research Institute for Mathematics and Physics 
Ecole de Physique 
UCLouvain School of Physics 
arXiv 
Open access to eprints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics 
inSPIREHEP 
HighEnergy Physics Literature Database 
Physical Review 
Physical Review Online Archive 
PDG homepage 
The Review of Particle Physics and the Particle Data Group 
PAI Fundamental Interactions 
Where to find the agenda of the Multiple Journal Clubs organized in the context of the PAI 
Astronomy Picture of the Day 
Each day a different picture or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
TIP : try "APOD" in google 
Convode 
Solves differential equations directly by email or by a web interface.
CONVODE is a powerful REDUCE package written to solve differential equations (D.E.), systems of D.E, partial D.E and Pfaffian equations (Total D.E).

MadGraph 
MadGraph is a matrix element generator. Given a process, it produces a fortran subroutine that computes the squared amplitudes making suitable calls to the HELAS library. You can also run event generation online. 
Delphes 
A framework for fast simulation of a generic collider experiment 