Blueprint Flipper is able to flip blueprints horizontally and vertically, has two buttons on the top of screen and hotkeys.

With a blueprint or blueprint book in hand, click on the associated button to flip the blueprint. Alternatively you can use the hotkeys:

Shift+z for Horizontal
Shift+x for Vertical

This version works with rail signals, train stations, Bob's Inserters and is updated for the 0.14 version of Factorio.

Credits to original authors: GopherAtl, Roktaal

https://github.com/Humpfry/Blueprint_Flipper

0.1.7 Fixed Localization in config options.
0.1.8 Added Bob's Inserters Drop and Pickup