- enVide neFelibata www.envidenefelibata.com
- The Pocket Arts Guide www.thepocketartsguide.com
- ATCs and ACEOs www.emptyeasel.com
- Kathleen Harrington www.kathleenharrington.com
- Museum of Pocket Art www.mopaonline.com
- Gordon Skalleberg www.gordonskalleberg.wordpress.com
- Andrea Tomkins www.usedeverywhere.com/atc-pocket-art/
- Art-o-mat www.artomat.org
- IUOMA - International Union of Mail-Artists www.iuoma-network.ning.com
- I-nigma QR Code Reader www.i-nigma.com