iPen – the first active stylus for the iPad | Ubergizmo
TruGlide Apex: Fine Point Electronic Stylus for iPad by Lynktec — Kickstarter
SonarPen: World's most affordable Smart Pen by GreenBulb — Kickstarter
This pressure-sensitive stylus makes almost any iPad mimic the iPad Pro via the headphone jack
Logitech Crayon Review - the Best Apple Pen Alternative for your iPad?
Solid Titanium Pen + Stylus by chadwick parker & joe huang — Kickstarter
ipad | Kickstarter Pens | kickstarterpens.com
Next Generation Stylus For iPad:The "Dart" With 2mm Fine Tip by Michael Majid — Kickstarter
Kickstarter: DUO Everyday Ballpoint Pen and Stylus - The Well-Appointed Desk
Amazon.com: [10-Pack] PencilCozy for Apple Pencil Cap: Grips iPencil, Protective Pen Cover, Tether, Prevent Damage, Works with Apple iPad Pro Pencil Gen 1(10-Pack White) : Electronics
Textured Feeling PenMat | PenTips
iPen: the first active stylus for iPad! by Cregle Inc. — Kickstarter
PenPad - An intuitive shortcut panel for Procreate® artists by Pen Tips — Kickstarter
Amazon.com: Adonit Log, Wooden Stylus Pen for iPad, Digital Pencil with High Precision, Palm Rejection, Compatible with iPad, iPad Pro, iPad Air, iPad Mini and More : Electronics
Hands on with PenTips 2: Replaceable tips for your Apple Pencil | AppleInsider
Kickstarter | iPadStylusBlog
Cregle's iPen is not the first digitizer pen for your iPad, despite claims on Kickstarter (updated) - The Verge