https://onetimesecret.com/ – also sends messages. Does not support images or view limits greater than 1, but does support requiring a password to view.
http://volafile.io/ – for sharing files. Create a private or public chatroom where you can upload files and they are deleted after 24 hours. See, for example, the Hacker News room: http://volafile.io/r/BCcsa6.
I've used one time secret for sending temporary passwords or sensitive numbers to colleagues without context. So much project communication takes place via insecure messaging such as email or im. It's not perfect security, but I've seen enough people have their websites hacked after having an email account compromised (and searched for the phrase 'password'). Tools like this don't so much give a false sense of security so much as remind the average person what a false sense of security they already have by using their cloud email service as a password manager.
The developer also open sourced it so it can be integrated into an IT department's internal workflow if trusting him is too much. The command line tool is also a nice touch.
Thanks for mentioning One-Time Secret. It used to support view limits but I removed the option to avoid the scenario where someone thinks it can be viewed only once but ends up still being available. It simplifies the UI as well.
https://onetimesecret.com/ – also sends messages. Does not support images or view limits greater than 1, but does support requiring a password to view.
http://volafile.io/ – for sharing files. Create a private or public chatroom where you can upload files and they are deleted after 24 hours. See, for example, the Hacker News room: http://volafile.io/r/BCcsa6.