Hi Sergio, the standard way to build UIs in Pharo is by using Spec. There is a video of me presenting it at the Pharo Days 2015 that gives you a first overview https://www.youtube.com/watch?v=OL23s9ZUIR0&feature=youtu.be&list=PL4actYd6bfnz98ngrKALwwStl3C3odEKG
There is also written documentation that is being updated now, so not really ready yet. One option is a paper of ours which is a bit out of date but still useful: https://hal.inria.fr/hal-00759030/document HTH, -- Does this mail seem too brief? Sorry for that, I don’t mean to be rude! Please see http://emailcharter.org . Johan Fabry - http://pleiad.cl/~jfabry PLEIAD and RyCh labs - Computer Science Department (DCC) - University of Chile > On Jun 6, 2016, at 15:59, sergio ruiz <sergio....@gmail.com> wrote: > > is there one GUI framework that is being used more than the others, or that > is more mature? > > Thanks! >