What are some free streaming services besides Crunchyroll which stream English Dubbed shows?
MyAnimeList compiled a list of The 18 Best International Sites to Legally Stream Anime. They do mention a few that offer dubs (and they mention Crunchyroll offers some dubbed titles), and they also mention the region availability. Not all of them are free, but most of these will offer at least some free content:


Funimation, Availability: US and Canada
AnimeLab, Availability: Australia and New Zealand
Hanabee, Availability: Australia and New Zealand
Hulu, Availability: US
Amazon, Availability: Global
The Anime Network, Availability: NA and UK
Animax TV, Availability: UK and Ireland
Manga Entertainment, Availability: UK and US
MyAnimeList, Availability: Global (dependent on title)
Anime Serien, Availability: Global (note: this site is not a streaming site, but rather one that helps you locate legal streams for anime subbed/dubbed in various European languages)