Online Spider Identification Websites
World Theridiidae genera by subfamilies
This site contains a pictorial guide to Theridiidae genera, with extracts of generic definitions.
Pholcidae - the longest legs in the web
Full of high-quality images of pholcids around the world, this is a must-read for those interested in pholcid identification.
Salticid Images
This is by far the best source of references for those interested in Southeast Asian jumping spiders. It contains thousands of specimen and genitalia images.
Nicky Bay's Spider Family Photo Checklists
Detailed checklists of some spider families with mostly in-situ photos.
Araneae: Spiders of Europe
Although it is intended for European users, this site contains a basic identification key that will help beginners to recognise the families.
digitalSpiders
This resource links specimen images of Southeast Asian spiders and DNA barcodes from quantitative ecological surveys, mainly in Vietnam.
Jumping spiders (Arachnida: Araneae: Salticidae) of the World
This interactive database documents the general appearances, genitalia, descriptions, maps and literature of jumping spiders worldwide.
New E-book and databases of Salticidae (Araneae) of the world
This massive e-book contains illustrations of salticid genitalia worldwide, and some third-party images from other online sources and published material.
Systematics & Monography of Araneiod Spiders
This is a gateway to interactive keys to several taxa, including Tetragnathidae and Nephilinae (now under Araneidae).
The Theridiidae (Araneae) of the World
This e-book provides a well-illustrated key to the theridiids with their diagnoses to the genera.
Spiders in Thailand
SpiderThailand.info is tool for photographic identification of Thai spiders, offering data on geographical occurrence within Thailand as well.
