gp2fasta is a tool for converting gp files from NCBI GenPept format to fasta. Its main purpose is to create fasta files with short, but still accurate headers for sequence. Additionally, you can download a free stand-alone version of gp2fasta written in QT4 library.

For example:
>Strpur-115729834-h
PNQILMQFRLDDNGSSYYKELASIIYGASPEFELAIFTVCFKENPNALSTFTMAGGITQKVQTWDYNGGYIGSAYFSV

stands for:
gi: 115729834
organism: Strongylocentrotus purpuratus
additional: h (hypothetical protein)
sequence:PNQILMQFRLDDNGSSYYKELASIIYGASPEFELAIFTVCFKENPNALSTFTMAGGITQKVQTWDYNGGYIGSAYFSV

URL: http://gp2fasta.ovh.org