Here are the top similar sites to mangago that you can use to continue reading your favorite manga comics online.
Mangakakalot
MangaOwl
Manga4life
MangaStream
KissManga
Ten Manga
Mangareade.
Webtoon
For more read - http://ideal.thesoftking.com/dizcuz/forum/threads/what-are-the-mangaowl-ultimate-alternatives