can anybody tell me if it is possible to create something like Web-to-lead(Integrate online forms with Salesforce) for custom objects.
Thank you in advance
I can think of two approaches, both involving visualforce pages and sites: https://developer.salesforce.com/page/An_Introduction_to_Force.com_Sites
First is to embed a visual workflow screen in a visualforce page, then expose the VF page via sites. The VF page is just a container and the flow has the fields and logic within in it. The VF page could be as simple as:
<apex:page> <flow:interview name="[name of flow here]" buttonLocation="bottom" finishLocation="[returnURL here]"> </flow:interview> </apex:page>
More information on flow here: https://help.salesforce.com/HTViewHelpDoc?id=vpm_admin_flow_overview.htm&language=en_US
The second option is to build all your own logic and custom VF page but still host it via a force.com site. The link below provides an example based upon using the Case object but should give you the basis to build your own from: https://developer.salesforce.com/page/Creating_Custom_Web-To-Case_Forms_Using_Visualforce_and_Sites
Girbot gave the correct answer for developers. If you (or others) aren't developers, then there are even easier solutions - use one of the many form tools available on the AppExchange. You can pick between FormAssembly, FormStack, FormWhatever... I forget all their names.
You will end up paying some USD $40 a month but this is a flat per-org (not per-user or per-form) price, so very reasonable. And some of them will do multi-page forms, or single-form to multiple custom objects, embedded iframes on your site, and other nifty features. Each tool has it's own strengths and weaknesses, so figure out the features you need and find the one that fits best.
Their feature sets are so different that some companies end up using two different form tools.
best of luck stony
The one solution we have come up with is using Zapier as a middle man solution. Honestly it works a treat. If you're using Wordpress for your forms this is even easier. Link is here if you want to take a look.