Barcode Studio is the free barcode generation solution for mostly all known barcodes. Currently the app is able to encode data in over 40 barcode symbologies.
The app is free (ad supported). There is an in-app purchase to remove ads, but the app is fully functional without this IAP.

To enable quick access to often used barcodes, you can add a generated barcode to your list of favorites. A history list shows all the barcodes you have generated in the past. These two features can be unlocked with an in-app purchase.

Input of barcode data is also possible by scanning an already existing barcode. This feature is handy if you want to resue barcodes or save your bonus cards on your phone.

Encoding happens on the smartphone and not with the help of a webservice. Therefore, you can create barcodes without being connected to the Internet.

Barcodes can be saved to an SD card, sent as email or shared via available Share Actions.

Currently the following symbologies are supported:
Code 11, Code 2 of 5 (interleaved), IATA, Data Logic, Industrial, Code 39 (extended), EAN, GS1-128, Codabar, Code 32, Code 49, Code 93, Code 128, Deutshe Post Leitcode, Deutsche Post Identcode, Code 16K, DataBar (14, limited, extended),
Telepen (alpha/numeric), UPC A/B, PostNet, MSI Plessey, LOGMARS, Pharmacode One-Track/Two-Track, PDF417 (truncated), Maxicode, QR Code (standard and micro), Australian Post Codes, ISBN, Royal Mail, Data Matrix, NVE-18, Japanese Postal Code, Korea Post,
GS1 DataBar-14 (stacked, omnidirectional, expanded stacked), PLANET, PDF417 (standard and micro), USPS OneCode, Plessey Code, ITF-14, Dutch Post KIX Code, Aztec Code (standard and runes).
HIBC is supported in all symbologies where a HIBC specification is available.