from: http://www.gnu.org/software/libiconv/

It provides support for the encodings:

European languages

ASCII, ISO-8859-{1,2,3,4,5,7,9,10,13,14,15,16}, KOI8-R, KOI8-U, KOI8-RU, CP{1250,1251,1252,1253,1254,1257}, CP{850,866,1131}, Mac{Roman,CentralEurope,Iceland,Croatian,Romania}, Mac{Cyrillic,Ukraine,Greek,Turkish}, Macintosh

Semitic languages

ISO-8859-{6,8}, CP{1255,1256}, CP862, Mac{Hebrew,Arabic}

Japanese

EUC-JP, SHIFT_JIS, CP932, ISO-2022-JP, ISO-2022-JP-2, ISO-2022-JP-1

Chinese

EUC-CN, HZ, GBK, CP936, GB18030, EUC-TW, BIG5, CP950, BIG5-HKSCS, BIG5-HKSCS:2001, BIG5-HKSCS:1999, ISO-2022-CN, ISO-2022-CN-EXT

Korean

EUC-KR, CP949, ISO-2022-KR, JOHAB

Armenian

ARMSCII-8

Georgian

Georgian-Academy, Georgian-PS

Tajik

KOI8-T

Kazakh

PT154, RK1048

Thai

ISO-8859-11, TIS-620, CP874, MacThai

Laotian

MuleLao-1, CP1133

Vietnamese

VISCII, TCVN, CP1258

Platform specifics

HP-ROMAN8, NEXTSTEP

Full Unicode

UTF-8
UCS-2, UCS-2BE, UCS-2LE
UCS-4, UCS-4BE, UCS-4LE
UTF-16, UTF-16BE, UTF-16LE
UTF-32, UTF-32BE, UTF-32LE
UTF-7
C99, JAVA

Full Unicode, in terms of uint16_t or uint32_t (with machine dependent endianness and alignment)

UCS-2-INTERNAL, UCS-4-INTERNAL

Locale dependent, in terms of `char' or `wchar_t' (with machine dependent endianness and alignment, and with OS and locale dependent semantics)

char, wchar_t
The empty encoding name "" is equivalent to "char": it denotes the locale dependent character encoding.

When configured with the option --enable-extra-encodings, it also provides support for a few extra encodings:

European languages

CP{437,737,775,852,853,855,857,858,860,861,863,865,869,1125}

Semitic languages

CP864

Japanese

EUC-JISX0213, Shift_JISX0213, ISO-2022-JP-3

Chinese

BIG5-2003 (experimental)

Turkmen

TDS565

Platform specifics

ATARIST, RISCOS-LATIN1

It can convert from any of these encodings to any other, through Unicode conversion.

following is from: http://www.iconv.org/

437
500
500V1
850
851
852
855
856
857
860
861
862
863
864
865
866
866NAV
869
874
904
1026
1046
1047
8859_1
8859_2
8859_3
8859_4
8859_5
8859_6
8859_7
8859_8
8859_9
10646-1:1993
10646-1:1993/UCS4/
ANSI_X3.4-1968
ANSI_X3.4-1986
ANSI_X3.4
ANSI_X3.110-1983
ANSI_X3.110
ARABIC
ARABIC7
ARMSCII-8
ASCII
ASMO-708
ASMO_449
BALTIC
BIG-5
BIG-FIVE
BIG5-HKSCS
BIG5
BIG5HKSCS
BIGFIVE
BS_4730
CA
CN-BIG5
CN-GB
CN
CP-AR
CP-GR
CP-HU
CP037
CP038
CP273
CP274
CP275
CP278
CP280
CP281
CP282
CP284
CP285
CP290
CP297
CP367
CP420
CP423
CP424
CP437
CP500
CP737
CP775
CP813
CP819
CP850
CP851
CP852
CP855
CP856
CP857
CP860
CP861
CP862
CP863
CP864
CP865
CP866
CP866NAV
CP868
CP869
CP870
CP871
CP874
CP875
CP880
CP891
CP903
CP904
CP905
CP912
CP915
CP916
CP918
CP920
CP922
CP930
CP932
CP933
CP935
CP936
CP937
CP939
CP949
CP950
CP1004
CP1026
CP1046
CP1047
CP1070
CP1079
CP1081
CP1084
CP1089
CP1124
CP1125
CP1129
CP1132
CP1133
CP1160
CP1161
CP1162
CP1163
CP1164
CP1250
CP1251
CP1252
CP1253
CP1254
CP1255
CP1256
CP1257
CP1258
CP1361
CP10007
CPIBM861
CSA7-1
CSA7-2
CSASCII
CSA_T500-1983
CSA_T500
CSA_Z243.4-1985-1
CSA_Z243.4-1985-2
CSA_Z243.419851
CSA_Z243.419852
CSDECMCS
CSEBCDICATDE
CSEBCDICATDEA
CSEBCDICCAFR
CSEBCDICDKNO
CSEBCDICDKNOA
CSEBCDICES
CSEBCDICESA
CSEBCDICESS
CSEBCDICFISE
CSEBCDICFISEA
CSEBCDICFR
CSEBCDICIT
CSEBCDICPT
CSEBCDICUK
CSEBCDICUS
CSEUCKR
CSEUCPKDFMTJAPANESE
CSGB2312
CSHPROMAN8
CSIBM037
CSIBM038
CSIBM273
CSIBM274
CSIBM275
CSIBM277
CSIBM278
CSIBM280
CSIBM281
CSIBM284
CSIBM285
CSIBM290
CSIBM297
CSIBM420
CSIBM423
CSIBM424
CSIBM500
CSIBM851
CSIBM855
CSIBM856
CSIBM857
CSIBM860
CSIBM863
CSIBM864
CSIBM865
CSIBM866
CSIBM868
CSIBM869
CSIBM870
CSIBM871
CSIBM880
CSIBM891
CSIBM903
CSIBM904
CSIBM905
CSIBM918
CSIBM922
CSIBM930
CSIBM932
CSIBM933
CSIBM935
CSIBM937
CSIBM939
CSIBM943
CSIBM1026
CSIBM1124
CSIBM1129
CSIBM1132
CSIBM1133
CSIBM1160
CSIBM1161
CSIBM1163
CSIBM1164
CSIBM11621162
CSISO4UNITEDKINGDOM
CSISO10SWEDISH
CSISO11SWEDISHFORNAMES
CSISO14JISC6220RO
CSISO15ITALIAN
CSISO16PORTUGESE
CSISO17SPANISH
CSISO18GREEK7OLD
CSISO19LATINGREEK
CSISO21GERMAN
CSISO25FRENCH
CSISO27LATINGREEK1
CSISO49INIS
CSISO50INIS8
CSISO51INISCYRILLIC
CSISO58GB1988
CSISO60DANISHNORWEGIAN
CSISO60NORWEGIAN1
CSISO61NORWEGIAN2
CSISO69FRENCH
CSISO84PORTUGUESE2
CSISO85SPANISH2
CSISO86HUNGARIAN
CSISO88GREEK7
CSISO89ASMO449
CSISO90
CSISO92JISC62991984B
CSISO99NAPLPS
CSISO103T618BIT
CSISO111ECMACYRILLIC
CSISO121CANADIAN1
CSISO122CANADIAN2
CSISO139CSN369103
CSISO141JUSIB1002
CSISO143IECP271
CSISO150
CSISO150GREEKCCITT
CSISO151CUBA
CSISO153GOST1976874
CSISO646DANISH
CSISO2022CN
CSISO2022JP
CSISO2022JP2
CSISO2022KR
CSISO2033
CSISO5427CYRILLIC
CSISO5427CYRILLIC1981
CSISO5428GREEK
CSISO10367BOX
CSISOLATIN1
CSISOLATIN2
CSISOLATIN3
CSISOLATIN4
CSISOLATIN5
CSISOLATIN6
CSISOLATINARABIC
CSISOLATINCYRILLIC
CSISOLATINGREEK
CSISOLATINHEBREW
CSKOI8R
CSKSC5636
CSMACINTOSH
CSNATSDANO
CSNATSSEFI
CSN_369103
CSPC8CODEPAGE437
CSPC775BALTIC
CSPC850MULTILINGUAL
CSPC862LATINHEBREW
CSPCP852
CSSHIFTJIS
CSUCS4
CSUNICODE
CUBA
CWI-2
CWI
CYRILLIC
DE
DEC-MCS
DEC
DECMCS
DIN_66003
DK
DS2089
DS_2089
E13B/
EBCDIC-AT-DE-A
EBCDIC-AT-DE
EBCDIC-BE
EBCDIC-BR
EBCDIC-CA-FR
EBCDIC-CP-AR1
EBCDIC-CP-AR2
EBCDIC-CP-BE
EBCDIC-CP-CA
EBCDIC-CP-CH
EBCDIC-CP-DK
EBCDIC-CP-ES
EBCDIC-CP-FI
EBCDIC-CP-FR
EBCDIC-CP-GB
EBCDIC-CP-GR
EBCDIC-CP-HE
EBCDIC-CP-IS
EBCDIC-CP-IT
EBCDIC-CP-NL
EBCDIC-CP-NO
EBCDIC-CP-ROECE
EBCDIC-CP-SE
EBCDIC-CP-TR
EBCDIC-CP-US
EBCDIC-CP-WT
EBCDIC-CP-YU
EBCDIC-CYRILLIC
EBCDIC-DK-NO-A
EBCDIC-DK-NO
EBCDIC-ES-A
EBCDIC-ES-S
EBCDIC-ES
EBCDIC-FI-SE-A
EBCDIC-FI-SE
EBCDIC-FR
EBCDIC-GREEK
EBCDIC-INT
EBCDIC-INT1
EBCDIC-IS-FRISS
EBCDIC-IT
EBCDIC-JP-E
EBCDIC-JP-KANA
EBCDIC-PT
EBCDIC-UK
EBCDIC-US
EBCDICATDE
EBCDICATDEA
EBCDICCAFR
EBCDICDKNO
EBCDICDKNOA
EBCDICES
EBCDICESA
EBCDICESS
EBCDICFISE
EBCDICFISEA
EBCDICFR
EBCDICISFRISS
EBCDICIT
EBCDICPT
EBCDICUK
EBCDICUS
ECMA-114
ECMA-118
ECMA-128
ECMA-CYRILLIC
ECMACYRILLIC
ELOT_928
ES
ES2
EUC-CN
EUC-JISX0213
EUC-JP
EUC-KR
EUC-TW
EUCCN
EUCJP
EUCKR
EUCTW
FI
FR
GB
GB2312
GB13000
GB18030
GBK
GB_1988-80
GB_198880
GEORGIAN-ACADEMY
GEORGIAN-PS
GOST_19768-74
GOST_19768
GOST_1976874
GREEK-CCITT
GREEK
GREEK7-OLD
GREEK7
GREEK7OLD
GREEK8
GREEKCCITT
HEBREW
HP-ROMAN8
HPROMAN8
HU
IBM-856
IBM-922
IBM-930
IBM-932
IBM-933
IBM-935
IBM-937
IBM-939
IBM-943
IBM-1046
IBM-1124
IBM-1129
IBM-1132
IBM-1133
IBM-1160
IBM-1161
IBM-1162
IBM-1163
IBM-1164
IBM037
IBM038
IBM256
IBM273
IBM274
IBM275
IBM277
IBM278
IBM280
IBM281
IBM284
IBM285
IBM290
IBM297
IBM367
IBM420
IBM423
IBM424
IBM437
IBM500
IBM775
IBM813
IBM819
IBM848
IBM850
IBM851
IBM852
IBM855
IBM856
IBM857
IBM860
IBM861
IBM862
IBM863
IBM864
IBM865
IBM866
IBM866NAV
IBM868
IBM869
IBM870
IBM871
IBM874
IBM875
IBM880
IBM891
IBM903
IBM904
IBM905
IBM912
IBM915
IBM916
IBM918
IBM920
IBM922
IBM930
IBM932
IBM933
IBM935
IBM937
IBM939
IBM943
IBM1004
IBM1026
IBM1046
IBM1047
IBM1089
IBM1124
IBM1129
IBM1132
IBM1133
IBM1160
IBM1161
IBM1162
IBM1163
IBM1164
IEC_P27-1
IEC_P271
INIS-8
INIS-CYRILLIC
INIS
INIS8
INISCYRILLIC
ISIRI-3342
ISIRI3342
ISO-2022-CN-EXT
ISO-2022-CN
ISO-2022-JP-2
ISO-2022-JP-3
ISO-2022-JP
ISO-2022-KR
ISO-8859-1
ISO-8859-2
ISO-8859-3
ISO-8859-4
ISO-8859-5
ISO-8859-6
ISO-8859-7
ISO-8859-8
ISO-8859-9
ISO-8859-10
ISO-8859-11
ISO-8859-13
ISO-8859-14
ISO-8859-15
ISO-8859-16
ISO-10646
ISO-10646/UCS2/
ISO-10646/UCS4/
ISO-10646/UTF-8/
ISO-10646/UTF8/
ISO-CELTIC
ISO-IR-4
ISO-IR-6
ISO-IR-8-1
ISO-IR-9-1
ISO-IR-10
ISO-IR-11
ISO-IR-14
ISO-IR-15
ISO-IR-16
ISO-IR-17
ISO-IR-18
ISO-IR-19
ISO-IR-21
ISO-IR-25
ISO-IR-27
ISO-IR-37
ISO-IR-49
ISO-IR-50
ISO-IR-51
ISO-IR-54
ISO-IR-55
ISO-IR-57
ISO-IR-60
ISO-IR-61
ISO-IR-69
ISO-IR-84
ISO-IR-85
ISO-IR-86
ISO-IR-88
ISO-IR-89
ISO-IR-90
ISO-IR-92
ISO-IR-98
ISO-IR-99
ISO-IR-100
ISO-IR-101
ISO-IR-103
ISO-IR-109
ISO-IR-110
ISO-IR-111
ISO-IR-121
ISO-IR-122
ISO-IR-126
ISO-IR-127
ISO-IR-138
ISO-IR-139
ISO-IR-141
ISO-IR-143
ISO-IR-144
ISO-IR-148
ISO-IR-150
ISO-IR-151
ISO-IR-153
ISO-IR-155
ISO-IR-156
ISO-IR-157
ISO-IR-166
ISO-IR-179
ISO-IR-193
ISO-IR-197
ISO-IR-199
ISO-IR-203
ISO-IR-209
ISO-IR-226
ISO646-CA
ISO646-CA2
ISO646-CN
ISO646-CU
ISO646-DE
ISO646-DK
ISO646-ES
ISO646-ES2
ISO646-FI
ISO646-FR
ISO646-FR1
ISO646-GB
ISO646-HU
ISO646-IT
ISO646-JP-OCR-B
ISO646-JP
ISO646-KR
ISO646-NO
ISO646-NO2
ISO646-PT
ISO646-PT2
ISO646-SE
ISO646-SE2
ISO646-US
ISO646-YU
ISO2022CN
ISO2022CNEXT
ISO2022JP
ISO2022JP2
ISO2022KR
ISO6937
ISO8859-1
ISO8859-2
ISO8859-3
ISO8859-4
ISO8859-5
ISO8859-6
ISO8859-7
ISO8859-8
ISO8859-9
ISO8859-10
ISO8859-11
ISO8859-13
ISO8859-14
ISO8859-15
ISO8859-16
ISO88591
ISO88592
ISO88593
ISO88594
ISO88595
ISO88596
ISO88597
ISO88598
ISO88599
ISO885910
ISO885911
ISO885913
ISO885914
ISO885915
ISO885916
ISO_646.IRV:1991
ISO_2033-1983
ISO_2033
ISO_5427-EXT
ISO_5427
ISO_5427:1981
ISO_5427EXT
ISO_5428
ISO_5428:1980
ISO_6937-2
ISO_6937-2:1983
ISO_6937
ISO_6937:1992
ISO_8859-1
ISO_8859-1:1987
ISO_8859-2
ISO_8859-2:1987
ISO_8859-3
ISO_8859-3:1988
ISO_8859-4
ISO_8859-4:1988
ISO_8859-5
ISO_8859-5:1988
ISO_8859-6
ISO_8859-6:1987
ISO_8859-7
ISO_8859-7:1987
ISO_8859-8
ISO_8859-8:1988
ISO_8859-9
ISO_8859-9:1989
ISO_8859-10
ISO_8859-10:1992
ISO_8859-14
ISO_8859-14:1998
ISO_8859-15:1998
ISO_9036
ISO_10367-BOX
ISO_10367BOX
ISO_69372
IT
JIS_C6220-1969-RO
JIS_C6229-1984-B
JIS_C62201969RO
JIS_C62291984B
JOHAB
JP-OCR-B
JP
JS
JUS_I.B1.002
KOI-7
KOI-8
KOI8-R
KOI8-T
KOI8-U
KOI8
KOI8R
KOI8U
KSC5636
L1
L2
L3
L4
L5
L6
L7
L8
L10
LATIN-GREEK-1
LATIN-GREEK
LATIN1
LATIN2
LATIN3
LATIN4
LATIN5
LATIN6
LATIN7
LATIN8
LATIN10
LATINGREEK
LATINGREEK1
MAC-CYRILLIC
MAC-IS
MAC-SAMI
MAC-UK
MAC
MACCYRILLIC
MACINTOSH
MACIS
MACUK
MACUKRAINIAN
MS-ANSI
MS-ARAB
MS-CYRL
MS-EE
MS-GREEK
MS-HEBR
MS-MAC-CYRILLIC
MS-TURK
MSCP949
MSCP1361
MSMACCYRILLIC
MSZ_7795.3
MS_KANJI
NAPLPS
NATS-DANO
NATS-SEFI
NATSDANO
NATSSEFI
NC_NC0010
NC_NC00-10
NC_NC00-10:81
NF_Z_62-010
NF_Z_62-010_(1973)
NF_Z_62-010_1973
NF_Z_62010
NF_Z_62010_1973
NO
NO2
NS_4551-1
NS_4551-2
NS_45511
NS_45512
OS2LATIN1
OSF00010001
OSF00010002
OSF00010003
OSF00010004
OSF00010005
OSF00010006
OSF00010007
OSF00010008
OSF00010009
OSF0001000A
OSF00010020
OSF00010100
OSF00010101
OSF00010102
OSF00010104
OSF00010105
OSF00010106
OSF00030010
OSF0004000A
OSF0005000A
OSF05010001
OSF100201A4
OSF100201A8
OSF100201B5
OSF100201F4
OSF100203B5
OSF1002011C
OSF1002011D
OSF1002035D
OSF1002035E
OSF1002035F
OSF1002036B
OSF1002037B
OSF10010001
OSF10020025
OSF10020111
OSF10020115
OSF10020116
OSF10020118
OSF10020122
OSF10020129
OSF10020352
OSF10020354
OSF10020357
OSF10020359
OSF10020360
OSF10020364
OSF10020365
OSF10020366
OSF10020367
OSF10020370
OSF10020387
OSF10020388
OSF10020396
OSF10020402
OSF10020417
PT
PT2
R8
ROMAN8
RUSCII
SE
SE2
SEN_850200_B
SEN_850200_C
SHIFT-JIS
SHIFT_JIS
SHIFT_JISX0213
SJIS
SS636127
ST_SEV_358-88
T.61-8BIT
T.61
T.618BIT
TCVN-5712
TCVN
TCVN5712-1
TCVN5712-1:1993
TIS-620
TIS620-0
TIS620.2529-1
TIS620.2533-0
TIS620
TS-5881
TSCII
UCS-2
UCS-2BE
UCS-2LE
UCS-4
UCS-4BE
UCS-4LE
UCS2
UCS4
UHC
UJIS
UK
UNICODE
UNICODEBIG
UNICODELITTLE
US-ASCII
US
UTF-7
UTF-8
UTF-16
UTF-16BE
UTF-16LE
UTF-32
UTF-32BE
UTF-32LE
UTF7
UTF8
UTF16
UTF16BE
UTF16LE
UTF32
UTF32BE
UTF32LE
VISCII
WCHAR_T
WIN-SAMI-2
WINBALTRIM
WINDOWS-1250
WINDOWS-1251
WINDOWS-1252
WINDOWS-1253
WINDOWS-1254
WINDOWS-1255
WINDOWS-1256
WINDOWS-1257
WINDOWS-1258
WINSAMI2
WS2
YU