Yes, it is. It is less obvious than FileSonic and Wupload (cousins, give me a break...) - but here are just a few details that when looked at as a whole prove I'm right:
1. Both FJ and FS are hosted at Choopa.
2. DMCA page lists two similar nearby
addresses in Hong Kong.
3.
HTML forms throughout the entire site share the exact same unique field names. Here are a few: "userEmail" field in lost password page, "loginUserName", "loginUserPassword", and "autoLogin" remember-me checkbox in login page, "userIAgree" and all other fields in signup page, etc.
4. Nearly
identical JavaScripts used at both sites.
5.
Emails from both sites are similar as well, down to the webmaster@ address as well as the very similar IP addresses used by the mail servers. mail.filejungle.com resolves to 216.155.132.212 and mail.fileserve.com to 216.155.134.124.
6.
Both sites make use of a subdomain that behaves the same way. http://l.fileserve.com and http://l.filejungle.com lead to an empty page with this ajax call: $("#ajaxReturn").load("/error.php", {'err': '404'}); Way out there for this to be coincidental.
7.
Nearly identical File Managers - different layout but same functionality with separate lists for pending web files, ftp files, remote files, etc. And again - same JavaScript used in both sites.
8. Also
identical JavaScript API powering both File Managers. Just one example - creating a new folder at FileServe posts to /file-manager.php the params "newFolderName=NAME&createFolderFormSubmit=Create+folder&folderId=&createFolderDest=0" and at FileJungle, it posts to /file-manager-action.php the params "newFolderName=NAME&createFolderDest=0"
9.
File Upload works the same exact way.. down to the API calls for progress check, etc. Same code, field names as well.
I can find many many more similarities. But I think by now you get the point - FileServe == FileJungle. I'm surprised this is news to some of you.