Triethylamine trihydrogenfluoride (More silanes)

Takin' off that TBDMS? TBAF isn't your only choice:

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TEA.(HF)3 is another source of the fluoride ion. Neat TEA-HF3 is a liquid, so it's about 10 M vs typical 1 M TBAF. A little nastier than TBAF, since it's able to liberate HF.

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Stick that TBDMS on Monday and helplessly flailing around, looking for a way to get your alcohol back? Have a little TBAF:
The fluoride ion is important to synthetic chemistry, often because it can be used to cleave silyl ethers (the silicon analogue of a carbon ether).