Genome Browser is the platform/database used for searching and retreiving sequences and annotation of genomes belong to various eukaryotes, prokaryotes, etc.
Following are the weblink for different available browsers:
http://www.ensembl.org/index.html
http://www.ncbi.nlm.nih.gov/genome
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UTGB (University of Tokyo Genome Browser) Toolkit is an open-source software for developing personalized genome browsers that work in web browsers.
http://utgenome.org/
Thanks for the list of good genome browsers. But if someone is looking to do some sort of coding/programming stuff and implement/add in any pipeline then GBrowse is there for the rescue. GBrowse is a combination of database and interactive web pages for manipulating and displaying annotations on genomes.
Find more at GBrowse wiki page http://gmod.org/wiki/GBrowse