The best replacement for stash is bitbucket.

The best alternatives to stash are rated as following:
★★★★★  bitbucket
★★★★★  github
★★★★  gitlab
★★★★  fisheye
★★★★  git
★★★★  tazo
★★★  gerrit
★★★  gash
★★★  commit
★★★  shelf
★★  twinings
★  sourcetree
★  no stash
★  crucible
★  tazo tea
★  stache
  senator skull

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

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



Google Trends

Scale is based on the average worldwide traffic of stash in all years. Click on graph for more.
stash
bitbucket
github