diff --git a/algorithms/czech.sbl b/algorithms/czech.sbl
new file mode 100644
index 00000000..279ac6f6
--- /dev/null
+++ b/algorithms/czech.sbl
@@ -0,0 +1,248 @@
+routines (
+  RV R1
+  palatalise
+  mark_regions
+  do_possessive
+  do_case
+  do_comparative
+  do_diminutive
+  do_augmentative
+  do_derivational
+  do_deriv_single
+  do_aggressive
+)
+
+externals ( stem )
+
+integers ( pV p1 )
+
+groupings ( v )
+
+stringescapes {}
+
+stringdef a' '{U+00E1}'
+stringdef c^ '{U+010D}'
+stringdef d^ '{U+010F}'
+stringdef e' '{U+00E9}'
+stringdef e^ '{U+011B}'
+stringdef i' '{U+00ED}'
+stringdef n^ '{U+0148}'
+stringdef o' '{U+00F3}'
+stringdef r^ '{U+0159}'
+stringdef s^ '{U+0161}'
+stringdef t^ '{U+0165}'
+stringdef u' '{U+00FA}'
+stringdef u* '{U+016F}'
+stringdef y' '{U+00FD}'
+stringdef z^ '{U+017E}'
+
+define v 'aeiouy{a'}{e^}{e'}{i'}{o'}{u'}{u*}{y'}'
+
+define mark_regions as (
+
+    $pV = limit
+    $p1 = limit
+
+    do (
+        gopast non-v setmark pV
+        gopast non-v gopast v setmark p1
+    )
+)
+
+backwardmode (
+
+  define RV as $pV <= cursor
+  define R1 as $p1 <= cursor
+
+  define palatalise as (
+    [substring] RV among (
+      'ci' 'ce' '{c^}i' '{c^}'
+      (<- 'k')
+      'zi' 'ze' '{z^}i' '{z^}e'
+      (<- 'h')
+      '{c^}t{e^}' '{c^}ti' '{c^}t{e'}'
+      (<- 'ck')
+      '{s^}t{e^}' '{s^}ti' '{s^}t{e'}'
+      (<- 'sk')
+    )
+  )
+
+  define do_possessive as (
+    [substring] RV among (
+      'ov' '{u*}v'
+      (delete)
+      'in'
+      (
+        delete
+        try palatalise
+      )
+    )
+  )
+
+  define do_case as (
+    [substring] among (
+      'atech'
+      '{e^}tem' 'at{u*}m'
+      '{a'}ch' '{y'}ch' 'ov{e'}' '{y'}mi'
+      'ata' 'aty' 'ama' 'ami' 'ovi'
+      'at' '{a'}m' 'os' 'us' '{y'}m' 'mi' 'ou'
+      'u' 'y' '{u*}' 'a' 'o' '{a'}' '{e'}' '{y'}'
+      (delete)
+      'ech' 'ich' '{i'}ch'
+      '{e'}ho' '{e^}mi' '{e'}mu' '{e^}te' '{e^}ti' '{i'}ho' '{i'}mi'
+      'emi' 'iho' 'imu'
+      '{e'}m' '{i'}m' 'es'
+      'e' 'i' '{i'}' '{e^}'
+      (
+        delete
+        try palatalise
+      )
+      'em'
+      (
+        <- 'e'
+        try palatalise
+      )
+    )
+  )
+
+  define do_derivational as (
+    [substring] R1 among (
+      'obinec'
+      'ovisk' 'ovstv' 'ovi{s^}t' 'ovn{i'}k'
+      '{a'}sek' 'loun' 'nost' 'teln' 'ovec' 'ov{i'}k' 'ovtv' 'ovin' '{s^}tin'
+      '{a'}rn' 'och' 'ost' 'ovn' 'oun' 'out' 'ou{s^}' 'u{s^}k'
+      'kyn' '{c^}an' 'k{a'}{r^}' 'n{e'}{r^}' 'n{i'}k' 'ctv' 'stv'
+      '{a'}{c^}' 'a{c^}' '{a'}n' 'an' '{a'}{r^}' 'as'
+      'ob' 'ot' 'ov' 'o{n^}' 'ul' 'yn'
+      '{c^}k' '{c^}n' 'dl' 'nk' 'tv' 'tk' 'vk'
+      (delete)
+      'ion{a'}{r^}'
+      'inec' 'itel'
+      'i{a'}n' 'ist' 'isk' 'i{s^}k' 'itb'
+      'ic' 'in' 'it' 'iv'
+      (
+        <- 'i'
+        palatalise
+      )
+      'enic' 'ec' 'en'
+      (
+        <- 'e'
+        palatalise
+      )
+      '{e'}{r^}'
+      (
+        <- '{e'}'
+        palatalise
+      )
+      '{e^}n'
+      (
+        <- '{e^}'
+        palatalise
+      )
+      '{i'}rn'
+      '{i'}{r^}' '{i'}n'
+      (
+        <- '{i'}'
+        palatalise
+      )
+    )
+  )
+  define do_deriv_single as (
+    [substring] among (
+      'c' '{c^}' 'k' 'l' 'n' 't'
+      (delete)
+    )
+  )
+
+
+  define do_augmentative as (
+    [substring] among (
+      'ajzn' '{a'}k'
+      (delete)
+      'izn' 'isk'
+      (
+        <- 'i'
+        palatalise
+      )
+    )
+  )
+
+  define do_diminutive as (
+    [substring] among (
+      'ou{s^}ek' '{a'}{c^}ek' 'a{c^}ek' 'o{c^}ek' 'u{c^}ek'
+      'anek' 'onek' 'unek' '{a'}nek'
+      'e{c^}k' '{e'}{c^}k' 'i{c^}k' '{i'}{c^}k' 'enk' '{e'}nk' 'ink' '{i'}nk'
+      '{a'}{c^}k' 'a{c^}k' 'o{c^}k' 'u{c^}k' 'ank' 'onk' 'unk'
+      '{a'}tk' '{a'}nk' 'u{s^}k'
+      'k'
+      (delete)
+      'e{c^}ek' 'enek' 'ek'
+      (
+        <- 'e'
+        palatalise
+      )
+      '{e'}{c^}ek' '{e'}k'
+      (
+        <- '{e'}'
+        palatalise
+      )
+      'i{c^}ek' 'inek' 'ik'
+      (
+        <- 'i'
+        palatalise
+      )
+      '{i'}{c^}ek' '{i'}k'
+      (
+        <- '{i'}'
+        palatalise
+      )
+      '{a'}k'
+       (<- '{a'}')
+      'ak'
+       (<- 'a')
+      'ok'
+       (<- 'o')
+      'uk'
+       (<- 'u')
+    )
+  )
+
+  define do_comparative as (
+    [substring] among (
+      '{e^}j{s^}'
+      (
+        <- '{e^}'
+        palatalise
+      )
+      'ej{s^}'
+      (
+        <- 'e'
+        palatalise
+      )
+    )
+  )
+
+  define do_aggressive as (
+    do do_comparative
+    do do_diminutive
+    do do_augmentative
+    do_derivational or do_deriv_single
+  )
+)
+
+define stem as (
+  do mark_regions
+  backwards (
+    do_case
+    do_possessive
+    // light and aggressive are the same to this point
+    // comment next line for light stemmer
+    do_aggressive
+  )
+)
+
+// Ljiljana Dolamic and Jacques Savoy. 2009.
+// Indexing and stemming approaches for the Czech language.
+// Inf. Process. Manage. 45, 6 (November 2009), 714-720.
+// http://members.unine.ch/jacques.savoy/clef/CzechStemmerLight.txt
+// http://members.unine.ch/jacques.savoy/clef/CzechStemmerAgressive.txt 
\ No newline at end of file
diff --git a/algorithms/slovak.sbl b/algorithms/slovak.sbl
new file mode 100644
index 00000000..a863e263
--- /dev/null
+++ b/algorithms/slovak.sbl
@@ -0,0 +1,246 @@
+routines (
+  R2
+  lower_case
+  un_accent
+  exception
+  mark_p1
+  mark_p2  
+  prefixes
+  suffixes
+  end_vowel
+)
+
+externals ( stem )
+integers ( p1 p2 )
+groupings ( vowel )
+
+stringescapes {}
+
+stringdef A"   '{U+00C1}'    // dlhe a
+stringdef A:   '{U+00C4}'    // siroke a
+stringdef C<   '{U+010C}'   // c s makcenom
+stringdef D<   '{U+010E}'   // d s makcenom
+stringdef E"   '{U+00C9}'    // e s dlznom
+stringdef E<   '{U+011A}'   // e s makcenom
+stringdef I"   '{U+00CD}'    // i s dlznom
+stringdef L"   '{U+0139}'   // l s dlznom
+stringdef L<   '{U+013E}'   // l s makcenom
+stringdef N<   '{U+013D}'   // n s makcenom
+stringdef O>   '{U+00D4}'    // o s vokanom
+stringdef O"   '{U+00D3}'    // o s dlznom
+stringdef R"   '{U+0154}'   // r s dlznom
+stringdef R<   '{U+0158}'   // r s makcenom
+stringdef S<   '{U+0160}'   // s s makcenom
+stringdef T<   '{U+0164}'   // t s makcenom
+stringdef U"   '{U+00DA}'    // u s dlznom
+stringdef U^   '{U+016E}'   // u s kruzkom
+stringdef Y"   '{U+00DD}'    // y s dlznom
+stringdef Z<   '{U+017D}'   // z s makcenom
+
+stringdef a"   '{U+00E1}'    // dlhe a
+stringdef a:   '{U+00E4}'    // siroke a
+stringdef c<   '{U+010D}'   // c s makcenom
+stringdef d<   '{U+010F}'   // d s makcenom
+stringdef e"   '{U+00E9}'    // e s dlznom
+stringdef e<   '{U+011B}'   // e s makcenom
+stringdef i"   '{U+00ED}'    // i s dlznom
+stringdef l"   '{U+013A}'   // l s dlznom
+stringdef l<   '{U+013E}'   // l s makcenom
+stringdef n<   '{U+0148}'   // n s makcenom
+stringdef o>   '{U+00F4}'    // o s vokanom
+stringdef o"   '{U+00F3}'    // o s dlznom
+stringdef r"   '{U+0155}'   // r s dlznom
+stringdef r<   '{U+0159}'   // r s makcenom
+stringdef s<   '{U+0161}'   // s s makcenom
+stringdef t<   '{U+0165}'   // t s makcenom
+stringdef u"   '{U+00FA}'    // u s dlznom
+stringdef u^   '{U+016F}'   // u s kruzkom
+stringdef y"   '{U+00FD}'    // y s dlznom
+stringdef z<   '{U+017E}'   // z s makcenom
+stringdef ia   'ia'        // ia
+stringdef ie   'ie'        // ie
+stringdef iu   'iu'        // iu
+
+define vowel 'aeiyou'
+
+define un_accent as repeat (
+	[substring] among (
+		'{a"}' (<-'a')
+		'{a:}' (<-'a')
+		'{c<}' (<-'c')
+		'{d<}' (<-'d')
+		'{e"}' (<-'e')
+		'{e<}' (<-'e')
+		'{i"}' (<-'i')
+		'{l"}' (<-'l')
+		'{l<}' (<-'l')
+		'{n<}' (<-'n')
+		'{o>}' (<-'o')
+		'{o"}' (<-'o')
+		'{r"}' (<-'r')
+		'{r<}' (<-'r')
+		'{s<}' (<-'s')
+		'{t<}' (<-'t')
+		'{u"}' (<-'u')
+		'{u^}' (<-'u')
+		'{y"}' (<-'y')
+		'{z<}' (<-'z')
+		'' (next)
+	)
+)
+
+define lower_case as repeat (
+	[substring] among (
+		'{A"}' (<-'{a"}')
+		'{A:}' (<-'{a:}')
+		'{C<}' (<-'{c<}')
+		'{D<}' (<-'{d<}')
+		'{E"}' (<-'{e"}')
+		'{E<}' (<-'{e<}')
+		'{I"}' (<-'{i"}')
+		'{L"}' (<-'{l"}')
+		'{L<}' (<-'{l<}')
+		'{N<}' (<-'{n<}')
+		'{O>}' (<-'{o>}')
+		'{O"}' (<-'{o"}')
+		'{R"}' (<-'{r"}')
+		'{R<}' (<-'{r<}')
+		'{S<}' (<-'{s<}')
+		'{T<}' (<-'{t<}')
+		'{U"}' (<-'{u"}')
+		'{U^}' (<-'{u^}')
+		'{Y"}' (<-'{y"}')
+		'{Z<}' (<-'{z<}')
+		'' (next)
+	)
+)
+
+define exception as (
+    [substring] atlimit among (
+        /* specialne */
+        'som' 'si' 'je'
+		'sme' 'ste' 'su'
+		'bol' 'bola' 'bolo'
+		'bud' 'budte' 'budme' 'budu'
+		'budem' 'budes' 'bude' 'budeme' 'budete'
+        (<-'byt')
+
+        'mam' 'mas' 'ma' 'mame' 'mate' 'maju'
+		'mal' 'mala' 'malo' 'mali'
+		'maj' 'majme' 'majte'
+        (<-'mat')
+
+        'idem' 'ides' 'ide' 'ideme' 'idete' 'idu'
+		'isiel' 'siel' 'isla' 'sla' 'islo' 'slo' 'isli' 'sli'
+		'chod' 'chodte' 'pod' 'podme' 'podte'
+		'pojdem' 'pojdes' 'pojde' 'pojdeme' 'pojdete' 'pojdu'		
+        'iduc' 'iduca' 'iduce' 'iduci'
+        (<-'ist')
+
+        'jem' 'jes' 'jedia' 'jeme' 'jete'
+		'jedol' 'jedla' 'jedlo' 'jedli'
+        'jedz' 'jedzte' 'jedzme'
+        (<-'jest')
+
+		'babiek' 'babicka'
+		(<- 'babk')
+
+		'dlan'
+		(<- 'dlan')
+
+		'matka' 'maticka' 'mamka' 'mamicka'
+		(<- 'mam')
+
+		'majetok'
+		(<- 'majetk')
+
+		'meste' 'miest'
+		(<- 'mest')
+
+		'sral' 'srali'
+		(<- 'ser')
+
+		'zien'
+		(<- 'zen')
+    )
+)
+
+define mark_p1 as (
+    $p1 = limit
+	gopast vowel gopast non-vowel setmark p1
+)
+
+define prefixes as (
+	do (
+		[substring] among (
+			'proti'
+			(
+				$p1 > 4 delete
+			)
+			'bez' 'cez' 'naj' 'nad' 'pod' 'pre' 'pri' 'roz'
+			(
+				$p1 > 2 delete
+			)
+			'do' 'od' 'ob' 'po' 'ne' 'vy' 'vz' 'za'
+			(
+				$p1 > 1 delete
+			)
+		)
+	)
+)
+
+backwardmode (
+
+    define R2 as $p2 <= cursor
+
+	define mark_p2 as (
+		$p2 = limit
+	)
+
+    define suffixes as (
+		do mark_p2
+        do (
+            [substring] R2 among (
+				'ejsieho' 'ejsiemu'
+				'ejsich' 'ejsimi' 'inovia' 'encoch' 'encami'
+				'ejsom' 'ejsim' 'ejsia' 'ejsie' 'ejsej' 'eniec'
+				'ejsiu' 'ejsou' 'inych' 'inymi' 'ovych' 'ovymi'
+				'inami' 'inovi' 'inoch' 'atami' 'atach' 'encom'
+				'avame' 'avate' 'avaju' 'ovala' 'ovalo' 'ovali'
+				'ujeme' 'ujete'
+				'ejsi' 'iemu' 'ieho' 'inmu' 'inho' 'inej' 'ence'
+				'inou' 'inov' 'inom' 'inym' 'ovia' 'iach' 'atom'
+				'ovho' 'ovej' 'ovou' 'ovym' 'ovmu' 'ovom' 'atam'
+				'ieme' 'iete' 'avam' 'avas' 'oval' 'ujem' 'ujes'
+				'ujme' 'ujte' 'ujuc'
+				'ovi' 'ovy' 'och' 'ami' 'ach' 'iam'	'eho' 'ete'
+				'ych' 'ich' 'ymi' 'imi' 'ini' 'ata' 'atu' 'uju'
+				'ina' 'inu' 'ino' 'ine' 'sie' 'emu' 'ati' 'uje'
+				'ime' 'ite' 'ila' 'ilo' 'ili' 'iem' 'ies'
+				'ali' 'ala' 'alo' 'ame' 'ate' 'aju' 'eme'
+				'ove' 'ovu' 'ovo' 'jte' 'jme' 'ska'
+				'ym' 'im' 'ia' 'ie' 'ej' 'iu' 'om' 'ou'
+				'ho' 'mu' 'ov' 'mi' 'am' 'in' 'at' 'is' 'il'
+				'va' 'vu' 've' 'vo' 'al' 'es' 'it' 'as' 'te'
+				'me'
+				'v' 'n' 'a' 'm' 'i'	'u' 'e'  'y'
+                (delete)
+            )
+        )
+    )
+
+    define end_vowel as (
+        [vowel] (delete)
+    )	
+)
+
+define stem as (
+  do lower_case
+  do un_accent
+  do mark_p1
+  do prefixes
+  exception or backwards (
+	  do suffixes
+	  do end_vowel
+  )
+)
diff --git a/libstemmer/modules.txt b/libstemmer/modules.txt
index 6940fd17..de4e48b1 100644
--- a/libstemmer/modules.txt
+++ b/libstemmer/modules.txt
@@ -13,6 +13,7 @@ arabic          UTF_8                   arabic,ar,ara
 armenian        UTF_8                   armenian,hy,hye,arm
 basque          UTF_8,ISO_8859_1        basque,eu,eus,baq
 catalan         UTF_8,ISO_8859_1        catalan,ca,cat
+czech           UTF_8,ISO_8859_2        czech,cz,cze
 danish          UTF_8,ISO_8859_1        danish,da,dan
 dutch           UTF_8,ISO_8859_1        dutch,nl,dut,nld
 english         UTF_8,ISO_8859_1        english,en,eng
@@ -32,6 +33,7 @@ portuguese      UTF_8,ISO_8859_1        portuguese,pt,por
 romanian        UTF_8,ISO_8859_2        romanian,ro,rum,ron
 russian         UTF_8,KOI8_R            russian,ru,rus
 serbian         UTF_8                   serbian,sr,srp
+slovak          UTF_8,ISO_8859_2        slovak,sk,svk
 spanish         UTF_8,ISO_8859_1        spanish,es,esl,spa
 swedish         UTF_8,ISO_8859_1        swedish,sv,swe
 tamil           UTF_8                   tamil,ta,tam