The best replacement for fetchmail is getmail.

The best alternatives to fetchmail are rated as following:
★★★★★  getmail
★★  offlineimap

Your alternative for fetchmail is not listed? Suggest!
Speaking about fetchmail, one probably shouldn't forget about procmail.

Other search terms related to fetchmail and their ratings are:
★★★★★ procmail
spamassassin
You have in mind a companion for fetchmail and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of fetchmail in all years. Click on graph for more.
fetchmail
getmail
offlineimap