QUERY - MOLECULAR GRAPHICS

[aiba $#at#$ ir.phys.chem.ethz.ch (Ayaz Bakasov, Phys. Chem., ETH Zurich)]

 Dear Netters,
 could someone advise me please on
 a molecular graphics software which:
 a) is ftp-able or commercial,
     for a workstation like IBM/RS or Alpha DEC;
 b) is for not too large molecules (atoms < 20-30);
 c) draws bonds and can mark them (length);
 d) draws bond angles and dihedral angles
      and can mark them;
 c) draws selected planes for pairs of bonds;
 e) puts (desirable) different colours
      on atoms and marks atoms (for slides);
 e) any other useful features on top
      of above-specified ones will be welcome
      (e.g. animation).
 Tried RASMOL and found that it is for
 VERY large molecules, while I need
 to draw molecules ranging from hydrogen peroxide
 to some first aminoacids. Also, RASMOL doesn't
 take care of small details I am interested in
 (like specification of bond angles and
  dihedral angles on the graph, or drawing
  planes of pairs of bonds)
 Perhaps, Mathematica or Maple
 have already some supplementary
 packages ?!
 Thank you.
 It will be my pleasure to summarize
 on the net the suggestions.
 Ayaz Bakasov.