What are some alternatives?
When comparing GRUB and Raindrop.io, you can also consider the following products
EasyBCD - EasyBCD is NeoSmart Technologies multiple award-winning answer to tweaking Windows bootloader.
Pocket - When you find something you want to view later, put it in Pocket.
PLoP Boot Manager - The PLoP Boot Manager is a small program to boot different operating systems.
Tagpacker - A free tool to quickly collect, organize, and share your favorite links.
Grub2Win - Safely dual boot Windows and Linux without touching the Windows MBR.
Diigo - Diigo is a powerful research tool and a knowledge-sharing community