Temp.sh is described as 'Temporary File Upload. 3 days. 2GB Size Limit. CLI and ShareX Support'. There are five alternatives to Temp.sh, not only websites but also apps for Self-Hosted solutions and Linux. The best alternative is oshi.at, which is both free and Open Source. Other great sites and apps similar to Temp.sh are termbin.com (Free, Open Source), Uguu.se (Free, Open Source), FilePush (Free) and Securesha.re (Free).