Team ManiAdd
Tasks are sometimes in spread sheet for circulation. Input them in traditional web calendar by flipping over months or weeks is a pain. ManiAdd simulate the spread sheet input method. You could add a batch in a row.

Assign and Remind
You could type email of the assignee, the task will be added to his calendar. It saves effort of typing and inviting one by one. You could set email reminder for each task.
Paste from Spreadsheet
To save most effort, copy and paste is perfect. Match the format of ManiAdd, spread sheet tasks could be pasted directly into Skelaxy. Saving you duplicated typing.