Need filter simulation program for Linux

[cdev]

Hello,  for a long time Ive been looking for a program that I can use to design different kinds of RF filters on Limux. Low pass filters, high pass filters, band pass filters and band stop filters. My usual go-to program is RFSim99 but the program is ancient and recently my Wine installation broke and I am in dependency hell and really need to find something newer and better, or get RFSim99 working again. Is there anything that compares to RFSim99?

It seems to me that qucs may have the features I need? At some point I had it installed on my machine but something broke it. it may only be available in Debian unstabble, if so if its good I can install it, probably. Would qucs do what I use RFSim99 for?  I really need that capability again.

Old and clunky as it is that program is super useful and at this point I am familiar with its limitations so get pretty decent use out of it.

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Update, qucs does filter design, although I still prefer RFSim99 I may warm to qucs as I learn more about it.

It will do for now.

[profdc9]

I have used qucs, and more recently, qucs-S (qucs with ngspice) for simulations and it is quite a nice program.  The harmonic balance needs work, but for linear simulations it should be more than adequate.  It won't do filter design though.